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Challenges to implementation of developmental screening in urban primary care: a mixed methods study



Research is needed to identify challenges to developmental screening and strategies for screening in an urban pediatric setting.


Parents of young children and clinicians at four urban pediatric practices participated in focus groups prior to implementation of screening. Participants were queried regarding attitudes, social norms, and barriers to developmental screening. Using information from the focus groups, workflow strategies were developed for implementing screening. Referral rates and satisfaction with screening were gathered at the conclusion.


Six focus groups of parents and clinicians were conducted. Major themes identified included 1) parents desired greater input on child development and increased time with physicians, 2) physicians did not fully trust parental input, 3) physicians preferred clinical acumen over screening tools, and 4) physicians lacked time and training to conduct screening. For the intervention, developmental screening was implemented at the 9-, 18-, 24-, and 30-month well visits using the Ages & Stages Questionnaire-II and the Modified Checklist for Toddlers. 1397 (98% of eligible) children under 36 months old were enrolled, and 1184 (84%) were screened at least once. 1002 parents (85%) completed a survey at the conclusion of the screening trial. Most parents reported no difficulty completing the screens (99%), felt the screens covered important areas of child development (98%), and felt they learned about their child’s strengths and limitations (88%).


Developmental screening in urban low-income practices is feasible and acceptable, but requires strategies to capture parental input, provide training, facilitate referrals, and develop workflow procedures and electronic decision support.

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The rates of detection of developmental delays are currently low. Approximately 12 to 16% of children are estimated to have developmental disorders [1, 2]. However, only 30% of children with developmental delays are diagnosed before school entrance [3]. Low-income children are at greater risk for developmental delays, with increased rates of developmental delays reported in lower income children compared to higher income children [4]. More specifically, single-parent households and households in poverty have an increased rate of children with developmental problems [4, 5]. Additionally, children with public health insurance are more likely to have special health care needs including developmental delays, and are at increased risk for long-term disability compared to children of higher socioeconomic status [6].

The identification of children with developmental delays before school entrance is vital to the well being of children. The adaptability of a child’s brain in the first 3 years of life makes identification of developmental delays and treatment with physical and psychosocial stimuli at a young age the foundation to a child’s developmental and behavioral outcomes [7, 8]. Lower income children treated with early intervention programs from birth to age 5 years old have been shown to score significantly higher in reading and mathematics by age 15, as well as had fewer instances of grade retention and special education requirements compared to those children treated from ages 5 to 8 years old [9]. The readiness of children for school, especially low income children, may also help circumvent the consequences of early academic failure and school behavior problems including high school drop-out rates, delinquency, unemployment, and mental health issues in young adulthood [8].

Due to the need for diagnosing developmental delay early in a child’s life and improving detection rates, recommendations for developmental screening in young children were made in 2006 by the American Academy of Pediatrics (AAP) and the Maternal Child Health Bureau (MCHB) [10]. These recommendations encouraged primary care clinicians to provide developmental surveillance at all well child visits and institute developmental screening with validated tools at critical developmental periods in childhood (i.e., at 9, 18, and 30 months of age). An additional recommendation included autism-specific screening at the 18 and 24-month visits [11]. Screening was defined as the use of brief standardized tools that have relatively high sensitivity and specificity for the specific population’s risk status, are reliable, and focus on all developmental domains at specific age intervals to identify developmental delays [10]. Surveillance was defined as the process of recognizing children at risk for developmental delays through maintaining accurate documentation for the child’s developmental history in the child’s medical record, asking parents about their child’s development, and observing the child’s development in addition to the physical exam without the use of a standardized screening tool [10]. Surveillance was more closely defined as “unstructured surveillance,” which relies on clinical acumen as opposed to “structured surveillance” that screening experts define as use of periodic screening tools [12]. The AAP’s recommendation emerged from the growing concern that primary care physicians under-identify young children with developmental delays [13].

The AAP’s recommendation regarding screening was made with limited information regarding the feasibility or broad acceptance of this policy, especially in urban settings that may have the most at-risk children [14, 15]. Previous studies have suggested that few clinicians have implemented developmental screening into their practices despite the dissemination of recommendations supporting their use [1620]. It is currently estimated that nearly half of pediatricians do not routinely use developmental screening tools for children under the age of 36 months [21]. This limited implementation of screening is not surprising given studies that have shown that physicians prefer to rely on developmental surveillance rather than developmental screening. However the limited implementation of screening is problematic as developmental surveillance alone may identify fewer than half of children with developmental delays [22, 23].

A growing body of literature suggests developmental screening is both effective and feasible if potential barriers are addressed adequately [24]. Barriers to screening that have been identified previously include lack of clinician knowledge and training, lack of adequate reimbursement for conducting screening, and the need to develop clinical workflow plans carefully [14]. In order to provide clinicians in urban low-income primary care settings with the information to undertake screening, we sought to contribute to the knowledge base by identifying challenges for developmental screening in these settings, developing strategies for conducting screening, and assessing the feasibility and acceptability of implementing a screening strategy. Specifically, we sought to employ a mixed methods study consisting of focus groups to identify the beliefs, practices, and perceived challenges that would contribute to poor adoption of developmental screening, and to use that information to inform implementation of developmental screening, rates of screening, and levels of satisfaction among parents and clinicians.



This mixed methods study was conducted from December 2008 to June 2010 at four urban pediatric primary care practices in Philadelphia. These practices experience more than 86,000 annual visits (22,500 under the age of five years). Children were eligible to participate if they were younger than 30 months old at the time of a visit, were greater than 36 weeks estimated gestational age, had no major congenital anomalies or genetic syndromes, were never placed in out-of-home foster care, and were not currently receiving Early Intervention Part C services. Clinicians were eligible if they were attending pediatricians, nurse practitioners, or pediatric residents at any of the participating practices. Medical students were excluded. The study was approved by the Institutional Review Board at the Children's Hospital of Philadelphia. Eligible participants including both parents and clinicians completed written informed consent. This study was a prelude to a clinical trial [25].

Focus groups

Prior to implementation of screening, we conducted two focus groups with parents and four focus groups with clinicians to identify perceptions related to developmental screening. Parents of children under the age of 5 were recruited to participate, as well as clinicians at the four participating practices. We used the Theory of Planned Behavior as a conceptual framework to guide our inquiry [26, 27]. This model proposes that the strength of an individual’s intentions to adopt a new behavior, developmental screening in this case, is dependent on their attitudes toward the behavior, the subjective norms and beliefs of those around them, and their perceived behavioral control (i.e., challenges they believed prevented them from conducting developmental screening) [26, 27].

Each focus group meeting consisted of four to eight participants [28]. Meetings lasted for approximately one hour and were led by trained facilitators. Each meeting consisted of open-ended questions followed by a summary of responses. The questions sought to identify perceptions related to the importance of developmental screening, current screening practices, and challenges to implementing universal screening in order to more accurately identify these challenges for implementation of developmental screening. For example, one question used in the focus groups for pediatricians was, “In the care of young children less than five years old in primary care settings, how important is periodic screening of the child’s development compared with other aspects of well child care?” Similar questions were adapted for the parent focus groups. To improve the validity of our findings, we summarized the main ideas and sought participant feedback at the conclusion of each meeting. An investigator (J.G.) was present at all meetings to record field notes.

All focus group meetings were audiotaped and transcribed. Transcripts were entered into Ethnograph 6.0 (Qualis Research Associates, Thousand Oaks, CA), a qualitative software program that allows users to code, organize, and conduct searches for themes across transcripts. Field notes compiled at the meetings were used to supplement information from the transcripts. Transcripts were initially read by seven investigators (D.M., S.P., A.B., N.B., M.G., J.P., J.G.) to identify major themes. This team of investigators included a diverse array of individuals from general pediatrics, developmental-behavioral pediatrics, psychology, and qualitative research methods. Reliability in the selection of themes was ensured during an investigator meeting that achieved consensus on the overall themes and code lists. Based on this list of themes, investigators (D.M. and A.B.) independently reread and coded all transcripts. The themes were coded using the constant comparative approach, and any differences were settled by consensus [29].

Implementation procedures

We developed an implementation strategy that encompassed the challenges identified in the focus groups including selection of developmental screening tools, clinician training methods, development of clinical workflow patterns, use of electronic decision support tools, and building a collaborative relationship with local early intervention (EI) agencies to share data. We garnered clinician input on the selection of screening tools through meetings at all four participating practices. After selection of tools, we developed an in-person training session to provide clinicians with an overview of the tools, information on administration and scoring of the tools, suggested text for interpreting positive screens with parents, and recommended referral procedures. Finally, we held meetings with staff from our local EI agency to develop agreements to share data on the status of EI referrals.


Our quantitative outcome measures were screening rates and clinician and parent satisfaction with screening processes. We developed ad hoc measures of satisfaction regarding developmental screening, ease and use of tools, challenges to screening, and overall satisfaction with screening. For each item, satisfaction was rated on a five-point likert scale from 1 = very dissatisfied to 5 = very satisfied. Clinicians were e-mailed a link to an electronic version of the survey following the completion of the study period. In the email, they were thanked for participating in the study, but were not provided with any incentives for completion of the survey. Parents were called by study staff and completed a phone survey similar to the clinician survey. Parents were queried concerning demographic characteristics, knowledge and attitudes towards screening, ease and use of tools, outcomes of screening, and overall satisfaction. Clinician and parent satisfaction surveys were entered into a Research Electronic Data Capture (REDCap) database at the Children’s Hospital of Philadelphia [30].

We collected information from our electronic health records (EHR) on the number of patient well child visits, developmental screening and surveillance tools completed, and the number of EI referrals made during the study period. We obtained EI referral data from the participating EI agency and merged it with EHR data using personal identifying information (medical record numbers, child name, child date of birth). Once data were merged, all personal health information was deleted prior to analysis. Prior to the screening intervention, referral to EI was approximately less than 10%, but no exact data existed at the local EI agency or at the Children’s Hospital of Philadelphia for accurate comparison.


We completed summary statistics on parent and clinician satisfaction surveys as well as EHR and EI referral data. The parents were not the same parents that were involved in the focus groups, however many of the same clinicians participated in both the focus groups and the satisfaction questionnaires. We categorized parent and clinician responses of “satisfied,” “very satisfied,” or “yes” as indicating agreement with each statement. We aggregated the proportion of patients who had a well visit, completed a developmental screening tool, had an EI referral, and completed an EI referral that included a multidisciplinary evaluation during the study period.


Six focus groups (two parent and four clinician groups) were conducted, involving a total of 8 parents and 22 primary care clinicians. The parents that participated were female and predominantly African-American, reflecting the population from which they were drawn (Table 1). Clinician participants were mostly female and Caucasian, and had been in practice an average of 16 years (Table 1). All except one clinician were Board Certified in Pediatrics. Themes derived from the focus groups were categorized using the Theory of Planned Behavior [26, 27]. We used three major categories to categorize themes according to the theoretical model: attitudes towards development, subjective norms towards screening, and perceived behavioral control towards implementing screening practices in the primary care setting.

Table 1 Characteristics of focus groups participants

Attitudes towards development

Both parents and clinicians endorsed the importance of discussing the child’s development during the well visit. However, parents felt pediatricians undervalued parental knowledge and concerns about child development (Table 2). Parents voiced a desire to provide greater input on their child’s development and share in treatment decisions. Conversely, clinicians perceived that parents in their practice lacked knowledge of normal development. They reported that they routinely did not rely solely on parental report of development, but utilized a combination of parental report, clinician observation, and clinician expertise to assess development (Table 2).

Table 2 Perceived challenges to screening from focus groups

Subjective norms towards screening

In these urban practices prior to this study, clinicians acknowledged that they frequently employed surveillance to assess development, relying on a set of age-specific milestones that were incorporated into the electronic health record to identify delays at well child visits. Clinicians reported validated developmental screening tools were used sporadically and only when parents raised concerns (Table 2). Likewise, parents felt clinicians did not spend adequate time to assess their children’s development. They desired more information on development for their children (Table 2). Parents preferred clinicians to be more proactive in referring their children to developmental services rather than using a watch-and-wait approach for screening and referral.

Perceived behavioral control toward implementing screening practices

Clinicians identified the following challenges to screening: lack of time to conduct screening, lack of reimbursement for completing developmental screening tools, and lack of training in the use of developmental screening tools. Time constraints within busy well child visits were recognized, and clinicians perceived that they could not eliminate important aspects of well childcare to accommodate screening (Table 2). At the time of this study, developmental screening was not reimbursed in these four practices. Clinicians acknowledged that additional funding might help facilitate screening by paying clinic staff to assist with screening procedures or allotting extra time during well visits to conduct screening. Finally, clinicians perceived a lack of training on the administration, scoring, and interpretation of tools.

Strategy for implementing screening

Using the information gathered from the focus groups, namely parents’ desire for more input on development and clinicians’ preference for a brief, validated, and global developmental screening tool, we made a list of validated screening tools for consideration in this urban clinic setting (Table 3). Table 3 illustrates our implementation of developmental screening strategy that includes suggestions from our focus groups. We convened an additional meeting with clinicians from participating practices in order to review the AAP recommendations for developmental screening and to provide an overview of a number of tools. Based on feedback from that meeting, we selected the Ages & Stages Questionnaires, Second Edition (ASQ-II) as a general developmental screener at the 9-, 18-, and 30-month well visits [31]. The ASQ-II accommodated parental self-report, clinicians’ preference for a milestone-based instrument, and adequate speech and language assessment that could also provide an educational tool for house staff, residents, and parents (Table 3). It was also recognized that the local EI agency used the ASQ-II as a first-stage screening tool for the evaluation of children with possible delays. We also selected the Modified Checklist for Autism in Toddlers (M-CHAT) at the 18- and 24-month well visits as it was a similarly validated parent self-report tool and was the only brief autism screener available in this age group [32].

Table 3 Implementation strategy for developmental screening

We provided training and education of Pediatric Residents and Attendings at their discretion in order to meet the clinicians’ desires from the focus groups of providing sufficient training and resources on developmental screening (Table 3). Group meetings were conveniently scheduled at each participating practice to conduct clinician training. At these meetings, we reviewed developmental screening recommendations, provided an overview of the screening tools selected, and gave hands-on instruction in the administration, scoring, and interpretation of the tools. For those who could not attend a group training, a training video was developed that could be reviewed at their leisure. Continuing medical education credits were provided to Attendings as an incentive to complete training, and the developmental screening tools were incorporated into the overall residency curriculum. For additional assistance, on-site clinic staff was available in each clinic to assist clinicians with screening.

We developed and incorporated electronic clinical decision support tools to support developmental screening at recommended well visits in order to include the clinicians’ request to have better access to developmental screening resources (Table 3). Alerts were automatically generated to remind clinicians that screening was due at a particular well visit. For the ASQ-II, an age-specific portable document format (PDF) was available through a link within the EHR that could be printed and provided to parents to complete. Clinicians could transfer parent responses to the EHR by selecting the appropriate radio buttons conforming to responses on a scoring grid, and an automated scoring algorithm would tally the responses and provide an overall score to minimize errors. For the M-CHAT, an electronic interactive version of the questions was available within the EHR. Similarly, clinicians could transfer parent responses to an automated scoring grid, which would provide an overall score.

To facilitate implementation and improve clinician efficiency as identified in the focus groups, we developed a workflow procedure for the implementation of screening (Figure 1, Table 3). According to the workflow, 15 days prior to scheduled well visits, parents were mailed the age-appropriate screening tools with instructions to complete the tools and bring them to their child’s upcoming well visit. Automated phone calls were made one day prior to scheduled visits to remind parents of the visit and to complete the screening tools. On the day of the visit, front desk staff took completed screeners from parents at check-in. If parents did not bring their pre-mailed screening tool completed, office staff provided parents with available screeners. Parents completed or had assistance from office staff to complete screening tools. Completed screening tools were either provided to clinicians or results were entered into the EHR by office staff prior to clinicians seeing the patients.

Figure 1
figure 1

Workflow procedures.

We developed a letter of agreement with the county EI agency preceding the study to permit information on referral status to be faxed to EI agency staff (Table 3). The clinic staff maintained a monthly tracking spreadsheet that early intervention agencies would update on a quarterly basis. This spreadsheet included information on the child’s date of assessment, referral date, medical record number, age, the status of enrollment in EI services, and the scheduling and evaluation results of multidisciplinary evaluations (MDE). The EI agency agreed to accept the ASQ-II/M-CHAT results as part of their intake for developmental evaluations. EI staff reported on the status of all referrals: referral intake, completion of referrals, scheduling of MDE, and results of MDE and status of services.

Screening results

One thousand three hundred ninety-seven eligible children under 31 months old were enrolled and followed for up to 18 months, and 1,184 (84.8%) parents/caregivers completed a developmental screening tool at least once during the study period (Table 4). Most children were male, African American, had mean family incomes of less than $30,000, and had a parent with greater than a high school education (see Additional file 1). There were no differences (p > 0.05) in demographic characteristics by practice site. Comparing the focus group caregiver participants to the screening intervention participants, the screening intervention parents were of slightly higher education levels, but of similar race and ethnicity (Table 1 and Additional file 1). Developmental screening resulted in 348 (24.9%) children being identified with developmental delays (Table 4). Two hundred fifty one children (18.0%) were referred for EI services, and 128 (9.2%) completed an EI referral (Table 4).

Table 4 Results of developmental screening

Once a parent completed a developmental screening visit, parents and clinicians were asked to complete satisfaction questionnaires, which typically occurred between one and 12 months after the well-child visit. Of the 1,184 who completed a developmental screen at a well visit and were eligible to participate in the survey, 1,016 parents (85.8%) completed the phone survey at the conclusion of the study. Most parents reported no difficulty completing the screens (98.6%), the screens covered important areas of child development (97.6%), and that the developmental screening tools helped them learn about their child’s strengths and challenges (88.3%) (Table 5). Of the 208 Attendings, Nurse Practitioners, and Residents, 123 (59.1%) completed the on-line survey. One-hundred sixteen clinicians (94.3%) felt that developmental assessment was an important part of well-child care (Table 6). Only 67 (54.5%) felt caregivers have a good understanding of typical child development. However, 120 (97.6%) valued the importance of seeking parental input regarding child development. Overall, most parents (98.5%) and clinicians (70.8%) reported satisfaction with developmental screening.

Table 5 Caregiver satisfaction with screening
Table 6 Clinician satisfaction with screening


Many of our findings are consistent with other research, including our focus group finding that parents desired a greater input on developmental decisions [33]. Prior research with parents of developmentally delayed children found that parents raised concerns about their child’s development more than a year before clinicians recognized a problem [34, 35]. These and other studies document that raising simple questions of concern with parents about a child’s development and learning may yield important information leading to identification of a problem [10, 36], have a positive impact on timely diagnoses of delays in young children [3639], and increase referral rates in developmentally delayed children as opposed to clinicians using a watch-and-wait approach to referring children to early intervention programs [14, 39, 40]. Thus, we sought to incorporate parent-report measures in our selection of appropriate screening tools.

Clinicians in this study perceived challenges to developmental screening including insufficient time and lack of training on developmental screening tools that have been noted in earlier reports [7, 41]. A study on two urban primary care practices found routine screening to be more feasible than expected when they addressed issues of time and training as we did in our screening strategy [24]. Clinicians in our study also identified workflow plans as an important factor in efficiently incorporating developmental screening, which has been found in other studies [24, 42]. When clinicians were deciding on an appropriate screening tool for their urban practices, the ASQ-II and M-CHAT were selected based on concurrent use by the local early intervention agency, their basis in milestones and parent report, and their ability to reinforce teaching on child development to residents and parents. Prior research has similarly shown decisions regarding screening tools are based on clinical flow, acceptance by local outreach programs or early intervention, and their ability to teach typical child development [42]. By addressing these challenges and implementing screening within current workflow parameters, participating practices showed a high rate of screening (84.8%). This is comparable to findings from other studies that have implemented screening strategies [42], but higher than that achieved by other urban clinics that have implemented screening [24].

Despite our high rate of screening, only 9.2% of children completed referrals to Early Intervention. Three-hundred forty eight children (24.9%) were identified with developmental delays through screening, but only 251 (65.4%) of those children were referred to Early Intervention. This may imply a higher reliance by pediatricians on clinical acumen and structured surveillance than on developmental screening tools, but more study is needed to assess this assertion. A greater proportion of those referred were male (p < 0.0001) or of African American race (p < 0.001). Of those referred to Early Intervention, 128 (51%) completed the referral. We do not fully understand why only half of parents completed the referral to Early Intervention with their child. We speculate that barriers to referral completion may be present. For example, in the satisfaction questionnaires given to parents after the implementation of screening, 236 parents answered, “Yes” to their child being recommended for Early Intervention. However, of those 236, only 189 (80%) agreed with the recommendation for referral. In addition there may be other factors that limit this urban population from completing referrals including lack of knowledge on the need for seeking Early Intervention services, lack of time, and limited resources such as disconnected phone numbers. In a study by Garg et al. that researched the impact of a family help desk at an urban clinic for low-income children, a disparity existed between the initial contact of parents and their receipt of community resources [43]. The barriers faced by low-income families including time constraints, childcare, and transportation issues were mentioned as possible reasons for this disconnect, but more research is needed on the subject [43]. Although a greater proportion of referred children were male or of African American race, we could not identify children for screening based on demographic characteristics. Moreover, our results show that once a clinician makes an EI referral in this high-risk population, additional care coordinator resources may be needed to facilitate the referrals [25].

Limitations to our findings exist. First, this study was conducted in a single geographical area using a non-random sample of participants from four practices. Thus, our findings may not be generalized to other geographic areas or other practices in the same geographic area. Second, our utilization of clinical work staff for dispersing screening tools to parents, screening children, entering screening tool results into the EHR, and keeping a quarterly-updated spreadsheet for EI referrals and correspondence on follow-up may not be feasible at other clinics. However, many of the patients participating in our study did not avail themselves of assistance from clinic staff and were still able to complete developmental screening [42]. Third, parents and clinicians were given satisfaction questionnaires between one and 12 months after their screening visit, which may have resulted in recall issues in answering satisfaction questions about the developmental screening. However, few parents and clinicians reported that they were unable to recall screening.

Despite these limitations, we believe that our findings have valuable implications for pediatric practices. Our results show that developmental screening is feasible in a high-risk, low-income population. By utilizing the input of parents and providers from urban primary care practice, we were able to create a workflow for screening that fit our practices, and received feedback in the form of satisfaction surveys to establish the acceptability of our strategy. Our results also suggest that clinicians in urban settings can utilize parental report from developmental screening tools to screen for developmental delays, provided sufficient practice-based resources are available such as clinician training and point-of-care electronic reminders. Other studies have found referral-tracking efforts to be too labor-intensive for clinic staff [42]. However, we have found that forming an agreement with an early intervention agency to share referral data and maintaining a referral spreadsheet by clinic staff was a successful way to track referrals.

The widespread adoption of clinical workflow procedures for implementing developmental screening has the potential to lead to greater identification of developmental delays in young children. Children of low socioeconomic status are at increased risk for developmental delays, and the adoption of effective and efficient developmental screening strategies can improve identification of delay in high-risk populations. Early developmental screening is an important strategy for identifying and helping children with delays as recommended by the AAP. This is especially true in urban clinics that serve a predominantly low socioeconomic population.


In this mixed methods study, parents and clinicians perceived developmental screening favorably, but a number of challenges to screening were identified. These included lack of agreement on whether parents could give accurate assessments of child development, clinician preference to rely on their clinical acumen, and limited time, insurance reimbursement, and training on screening. With knowledge of these perceived challenges, we utilized clinician input to select parent-reported screening tools, developed workflow procedures to enhance screening efficiency, provided clinician training using flexible formats, implemented electronic decision tools to support screening, and made collaborative arrangements with EI agencies to share data on the results of screening and referrals. These strategies resulted in 84.8% of children being successfully screened. In addition, parents and clinicians reported overall satisfaction with screening procedures.



American academy of pediatrics


Ages & stages questionnaires, second edition


Continuing medical education


Electronic health record


Early intervention


Modified checklist for autism in toddlers


Multidisciplinary evaluations


Portable document format.


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We wish to thank the parents, clinicians, and office staff who participated in our focus groups at The Children’s Hospital of Philadelphia. We also wish to thank Yuan-Shung Huang for her statistical analysis.


This study was financially supported by grant R18DD000345 from the Centers for Disease Control and Prevention (principal investigator: Dr. Guevara).

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Correspondence to James P Guevara.

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No competing interests have been identified with any of the authors.

Authors’ contributions

JG conceived of the study, wrote the grant and protocol, acquired the data, analyzed and interpreted the data, and drafted and revised the manuscript. DM helped conduct the study, interpreted and analyzed the data, and drafted and revised the manuscript. SP helped critically revise the manuscript and interpret the data. AB helped conduct the study, interpret and analyze the data, and critically revise the manuscript. NJB helped critically revise the manuscript and interpret data. MG helped conceive of the study, conduct the study, and critically revise the manuscript. JPM critically revised the manuscript and analysis. All authors read and approved the final manuscript.

Deanna L Morelli and James P Guevara contributed equally to this work.

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Additional file 1: Characteristics of children screened. A demographic comparison of children who were screened for developmental delay, identified with delay, referred to early intervention, and completed the early intervention referral. P-values were reported to show significance. (DOCX 101 KB)

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Morelli, D.L., Pati, S., Butler, A. et al. Challenges to implementation of developmental screening in urban primary care: a mixed methods study. BMC Pediatr 14, 16 (2014).

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