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Health-Related Quality of Life and mental health of families with children and adolescents affected by rare diseases and high disease burden: the perspective of affected children and their siblings

Abstract

Background

Advances in genetic and pharmaceutical technology and pediatric care have enabled treatment options for an increasing number of rare diseases in affected children. However, as current treatment options are primarily of palliative nature, the Health-Related Quality of Life (HRQoL) and mental health of this impaired population and their siblings are of increasing importance. Among children and adolescents with rare diseases, those who are technology-dependent carry a high disease burden and are selected as the target population in our study. In a cross-sectional observational design, the children’s HRQoL was assessed with the DISABKIDS (DCGM-37) as well as KIDSCREEN-27, while mental health was assessed with the Strengths and Difficulties Questionnaire (SDQ) by both the affected children, their parents, and siblings.

Results

Results of the study sample were compared to normative data. Affected children scored significantly lower than the norm on almost all HRQoL subscales as reported by parent and child. From the parental perspective, more mental health subscales were significantly impaired compared to the child’s perspective. Siblings showed no impairment in HRQoL as well as significantly fewer behavioral problems and higher prosocial behavior regarding their mental health compared to the norm.

Conclusion

Children and adolescents with rare diseases seem particularly impaired in social and emotional aspects of HRQoL and mental health. Interventions may focus primarily on promoting social skills, fostering prosocial behavior and peer relationships.

Peer Review reports

Background

Rare diseases are estimated to affect between 2.4 and 5.0 million people in Germany [1]. The European Union defines these rare diseases by a prevalence of under one in 2000 [2]. Despite the considerable heterogeneity in the clinical presentations of the diseases, the burden on affected families can be quite comparable [3, 4]. The often-delayed diagnosis as well as limited treatment options add to the high level of distress within the family system [5, 6]. The associated physical and emotional strain for the families providing care [7,8,9] is often detrimental, especially for the patients themselves [10, 11].

Patients with rare diseases face a multitude of challenges, including emotional, cognitive, and physical impairments [12], which can negatively impact their Health-Related Quality of Life (HRQoL) and mental health [13, 14]. HRQoL can be defined as the child’s “perceived well-being in physical, mental and social domains of health […]” [15], whereas mental health can be defined as a “dynamic state of internal equilibrium which enables individuals to use their abilities in harmony with universal values of society. […]” [16]. Considering rare pediatric diseases within the diathesis-stress model [17], the lower HRQoL and mental health of the diseased children can be explained by an interplay of individual vulnerabilities, a high disease burden, and experienced stressful life events.

Previous research shows that chronically ill ventilator-dependent children and adolescents have a decreased self-reported HRQoL compared to healthy peers [18, 19]. Moreover, studies on parent ratings of children requiring long-term home mechanical ventilation show that affected children have a lower HRQoL compared to healthy children [18, 19] and children with chronic diseases [20]. Previous studies could also demonstrate that patients requiring mechanical ventilation have a significantly lower self-reported and parent reported HRQoL compared to pediatric patients with other chronic diseases [21]. Additionally, a recent study found that patients requiring mechanical ventilation had a significantly lowered HRQoL compared to norm values of healthy children, regardless of ventilator usage [22].

Although there is little research evaluating mental health in children requiring mechanical ventilation, a large-scale population study could show that children suffering from a chronic illness had an elevated risk of developing emotional and behavioral problems compared to their healthy peers [23]. Another study found heightened chances of developing a psychiatric illness in all groups of chronically ill children [24]. Previous studies could also show that youths suffering from a chronic disease have a high prevalence of depression and anxiety [25], higher levels of depressive symptoms compared to healthy peers [10], and are more likely to engage in suicidal ideation and self-harm [26]. These mental health problems may persist beyond childhood and adolescence into adulthood [27].

Although the psychosocial needs of siblings of technology-dependent children have been studied qualitatively, to our knowledge, there are no quantitative results on HRQoL and the mental health of affected siblings [14]. However, in an interview-based study, siblings of medical technology-dependent children described an increased number of responsibilities from a young age, either in domestic or medical nature, as well as low mental health, a lack of time for social activities, and tense atmospheres in their homes [28]. While these insights suggest a lowered HRQoL in siblings, studies specifically investigating HRQoL in siblings of chronically ill children have shown mixed results thus far, with some results suggesting equal or even better HRQoL than peers, while others indicate worse HRQoL compared to peers [29].

Since a technological dependency exerts a significant burden on everyday life, it can adversely impact HRQoL [13] and negatively influence mental health [30]. This may particularly apply to children and adolescents affected by rare diseases associated with a specific high need for care. We studied the HRQoL and mental health of the affected children and their siblings using validated instruments. Previous studies investigating the burden of severe chronic diseases have mostly been limited to single disease groups. In contrast, this study aims to examine a study population with a variety of rare diseases, resulting in technological dependency in the progression of the disease. Therefore, the current study addresses the following question: How are HRQoL and mental health of children and adolescents affected by rare diseases with high disease burden and HRQoL and mental health of their siblings distributed?

Four hypotheses were tested in this regard: (1) The HRQoL of children affected by rare diseases and high disease burden is significantly lower compared to norm data of children with various chronic diseases, (2) the mental health of children affected by rare diseases and high disease burden is significantly more impaired in comparison to children and adolescents of population-based norm data, (3) siblings of children affected by rare diseases and high disease burden have significantly lower HRQoL compared to normative data, (4) siblings of children affected by rare diseases and high disease burden have significantly more emotional and behavioral problems in comparison to normative data.

Methods

Study design

The study data presented are part of the CHROKODIL project, which evaluated the psychosocial burden of families of children and adolescents with serious physical illness. The current project focused on a group of children with rare diseases and high disease burden, as well as a current or impending technological dependency, using a one-group cross-sectional design. The current study data represents an expansion of the work of Boettcher et al. (2020) [31], who examined the psychosocial distress of parents in the CHROKODIL sample, and the work of Johannsen et al. (2020) [22], who examined the neuromuscular disease subsample regarding the impact of long-term ventilation on psychosocial needs of affected families. Children’s self-report and a parent report were obtained. The study received funding from the Werner Otto Foundation and ethical approval from the Medical Chamber Hamburg (PV 4361).

Variables and instruments

Sociodemographic and clinical outcomes: Participants were asked to complete a sociodemographic questionnaire about their sex, age, socioeconomic status, and the number of siblings. Clinical outcomes comprised the type and duration of ventilation, as well as the categorization of pediatric conditions according to the recommendations of the German Society of Pneumology and Mechanical Ventilation [32].

Health-related quality of life: The DISABKIDS Chronic Generic Measure-37 (DCGM-37) [33] assesses HRQoL in children and adolescents aged 4 to 16 years. Both the self-report questionnaire (child version), as well as a version for parents were used. Six respective subscales are being measured. Item raw scores are converted into a standardized 0–100 scale, with greater values representing better HRQoL. A total score illustrates overall HRQoL. The DCGM-37 has shown good psychometric properties [34]. The DCGM-37 provides norm data for self-report and parent report ratings of chronically ill children suffering from different chronic diseases [33].

Siblings’ health-related quality of life: The KIDSCREEN-27 [35] was used to assess siblings’ self-reported HRQoL. The instrument consists of 27 items and operationalizes five dimensions. Higher scores indicate greater HRQoL. The KIDSCREEN-27 has shown good psychometric properties [35].

Mental health: The Strengths and Difficulties Questionnaire (SDQ) [36] measures emotional and behavioral strengths and difficulties within five subscales. A total score indicates overall difficulties. In the current study, the German SDQ version for children between the age 3 and 16 years was utilized [37] in parent report and self-report for both diseased children and their siblings. Greater scores indicate more severe problems on every subscale, except for prosocial behavior. The German self-report and parent report versions of the SDQ have shown acceptable internal consistencies [38, 39]. The instrument provides norm data for self-report and parent report ratings of German children and adolescents in the general population [40, 41].

Sample

Patients included in the study had to be under age 21 suffering from a rare disease with a high disease burden defined as a technological dependency (such as ventilation) and high need for everyday care and support. Patients with a disease progression threatening technological dependency, including the other criteria, were also included. Exclusion criteria were defined as severe physical, mental or cognitive impairments. Parents provided signed informed consent, and if possible, additionally the patients and siblings themselves. It was possible for participants to discontinue their participation in the study at any time.

Regarding the sampling procedure of the CHROKODIL project, reference is made to the previously published articles of the project [22, 31]. In the current study, data on HRQoL and mental health of 62 children and adolescents (38 male, 24 female) were gathered. Parents provided HRQoL and mental health ratings for 44 affected children, and 25 patients provided self-ratings. For seven self-ratings, corresponding parent-ratings were available. In addition, data for 31 siblings were available. Children eight years or older were asked to complete self-ratings on the included questionnaires. Thirty-five (79.5%) of all questionnaires answered by a parent were completed by the mother. All diseases of the participants met the European Commission definition of rare diseases [2].

Statistics

Group differences between the studied sample and norm reference values were examined with one-sample t-tests. Intra-class correlations (ICC) were conducted between patient self-report and parent reports. Cohen’s d was calculated to give an estimate of the effect size. Statistical significance was set at p ≤ 0.05 (two-tailed). To address possible bias due to missing data, multiple imputation using the Expectation–Maximization approach was used. Statistical analyses were conducted using SPSS Statistics 26.

Results

Patient characteristics

Main patient’s characteristics are shown in Table 1. The pediatric diseases included in the sample consisted of central respiratory disorders (9.7%), restrictive ventilatory disorders (80.6%) with neuromuscular disorders (62.9%) as the most frequent conditions, and obstructive ventilatory disorders (9.7%). The chronically diseased sample consisted of more males (61.3%) than females (38.7%). Among the siblings, on the other hand, there were fewer males (32.3%) than females (67.7%). Most children lived with both their mother and father (72.6%). The socioeconomic status was low in 11.3%, moderate in 48.4%, and high in 40.3%.

Table 1 Characteristics of the sample

Health-related quality of life

Table 2 presents the mean values of HRQoL according to the DCGM-37 scales for both reports in the study sample. Additionally, a comparison to norm data of children suffering from various chronic conditions is given. On almost all subscales and the total score of the DCGM-37, scores were significantly lower than those of the norm group. This applies to both self-report and parent report, with effect sizes ranging from small to large. However, on the subscale emotion in the parent report and medical treatment for the self-report and parent report, the study sample showed no differences to the norm group. Post-hoc analyses concluded low to moderate agreement between self-reports and parent-reports on HRQoL (ICC = 0.11-0.59).

Table 2 Distribution of HRQoL for the self-report and parent report in the DCGM-37 and comparison to norm data of chronically ill children

Mental health

Table 3 shows the mean values of emotional and behavioral problems in the sample and a comparison to population-based norm data from Germany. Regarding the children’s self-reports, the sample scored significantly higher only on the peer problems subscale, compared to norm data. In the parent report, the study sample scored significantly higher on the hyperactivity and peer problems subscale, as well as on the total SDQ scale, albeit lower on the prosocial behavior subscale, than norm data, with effect sizes ranging from small to large. Concordance of self- and parent-ratings was found to be poor to medium (ICC = 0.00-0.44).

Table 3 Distribution of mental health self-report and parent report ratings in the SDQ and comparison to norm data

Siblings

Table 4 shows the mean values of HRQoL and mental health in siblings of children with rare diseases and a comparison to norm data. None of the HRQOL scales showed significant differences from the norm. Regarding mental health, siblings scored significantly lower in the subscale conduct problems and significantly higher in prosocial behavior. No other significant differences could be found.

Table 4 Distribution of HRQoL and mental health as self-report in siblings and comparison to norm data

Discussion

Considering that rare diseases can have a major effect on patients and families, it is emphasized that decisions made by health care providers should be grounded on data that come from the affected individuals themselves [42]. Assessing the HRQoL and mental health of affected children and adolescents is therefore especially valuable in tailoring support for this highly stressed group. Consequently, the present study explored HRQoL and mental health of children and adolescents suffering from rare diseases resulting in technological dependency and their siblings.

Findings indicate that children with rare diseases have significantly lower self- and parental perceptions of global HRQoL in comparison to norm data of children and adolescents with various chronic diseases, which is in line with previous research [18, 43]. These results thus confirm our first hypothesis within the diathesis-stress model [17]. Although the study group had significantly lower scores in most of the subscales, this pattern could not be found for the treatment subscale, which assesses the perceived impact of receiving medical treatment. Interestingly, no significant difference for both self and parental perceptions could be found in this subscale. One interpretation of this finding could be the vital role of treatment for the survival of these technology-dependent children and adolescents with a rare disease, hence it might not be viewed negatively [44]. It is likely that parents view their older children as more accustomed to the medical treatment, which may also have a positive impact on this subscale. Albeit a significant difference between the study group and the norm group was found in the self-reported emotional dimension of HRQoL, no difference was found in the parent report. While the emotional impact of the disease may be highly relevant for the affected children and adolescents, this dimension may be rather difficult for the parents to recreate fully. This is in line with prior findings, which state that agreement on HRQoL ratings is generally lower in non-observable subscales [45]. As previous research already stated [18], patients may become more aware of their situation with growing age and therefore perceive a higher physical limitation. Our research suggests that there is poor to moderate agreement between parent and child ratings concerning HRQoL. However, parents perceived their children’s HRQoL as generally lower than the children themselves, which is in concordance with previous research [18, 44]. Affected children might focus more on their individual abilities and thus rate their HRQoL as higher compared to their parents, whose lower ratings may be linked to their overprotectiveness and concerns [3].

With regards to emotional and behavioral problems, the parent reported overall difficulties score was significantly higher in the study sample compared to peers, which is consistent with past research on the mental health of children with chronic diseases [25, 27]. Greater levels of internalizing and externalizing problems reported in former research on chronically physically ill youth [10, 23] were only partially reflected by our data. This might be a consequence of using rather unspecific broad-band scales, wherein the context of our study, some sensitivity might get lost, as suggested in previous research for samples with a low risk of mental disease [46]. However, considering that our sample is classified as high-risk for psychiatric illnesses, the use of the broader SDQ subscales was not shown to be helpful.

A differentiated view on the mental health subscales reveals that parents rated their children’s hyperactivity as significantly higher in comparison to norm data of German children, which is consistent with previous studies [23, 24]. Furthermore, the study group presents difficulties in social subscales of mental health. Even though the patients did not perceive their prosocial behavior to be significantly different compared to other children, their parents did. Since pediatric chronic conditions have been linked to social deficits [47], it can be assumed that the patients in the present study have compromised social skills. This is in line with previous research indicating that permanent dependency on medical technological devices creates significant barriers in social life [48, 49] and is linked to lowered self-esteem due to social exclusion, as it is experienced by some ventilator-dependent children [50]. This suggestion is underlined by the fact that not only the parents but also the affected children gave significantly higher ratings on the subscale peer problems compared to norm data. Difficulties in social interaction have already been addressed regarding HRQoL in the present study and may put pediatric patients at risk for having peer problems. Thus, children with rare diseases may not have the chance to develop appropriate social skills for forming healthy relationships with same-aged youths. Apparently, as reflected by our data, the second hypothesis especially applies to social aspects of mental health. As mentioned before, neither the use of the rather unspecific broad-band scales nor the previous gender-specific findings seem to be the case for this highly impaired sample. With respect to emotional and behavioral problems, self-report and parent-ratings on the total difficulties score and the corresponding subscales had poor concordance.

Although research to date on HRQoL of siblings of children with chronic diseases has suggested that some siblings may have lowered HRQoL due to the impact of the disease on the home environment [51], this could not be found in our study sample. Instead, it was shown that siblings of children with rare diseases have comparable HRQoL to normative control data. In addition, siblings reported neither impairment in their HRQoL, nor their mental health, even indicating fewer conduct problems and more prosocial behavior than the healthy norm. One explanation for this finding could be that siblings have a more positive view of what it means to be healthy because they experience their sister's or brother's illness as a daily reference [52], or that taking on more responsibilities from a younger age [28] teaches them to act more prosocial. Moreover, there is evidence that having a chronically ill brother or sister may positively affect the healthy sibling, including a more caring and warm personality [53]. However, due to the overall mixed results on HRQoL in siblings of children with chronic diseases, it might still be helpful to offer targeted interventions to improve the well-being of siblings. For instance, special programs or leisure camps aimed at adjusting to having a sibling with a chronic illness can help build knowledge and self-esteem [51]. These results indicate that the third and fourth hypotheses could not be confirmed.

Strengths and limitations

Within the study the following limitations should be considered. Due to the long study duration and demands of data collection on patients, this study is based on a small sample size, limiting statistical power and generalizability and therefore results should be evaluated with care. However, recruitment of this study group is particularly challenging due to the severity of the diseases. Although the heterogeneity of rare diseases might be a limitation, there was one consistent feature, meeting the definition of a rare disease resulting in technological dependency in the progression of the disease. Thus, the study sample does represent severe somatic illnesses, that are linked to a particularly high level of care and disease management.

Recruitment of the patients took place in two institutions in Germany. Therefore, transferring the results to countries with other health care systems should be considered with precaution. Additionally, due to the fact that only a part of the identified families could be included within the CHROKODIL project, a selection bias cannot be ruled out. Regardless of these constraints, the findings of the present study deserve to be considered as relevant data indicating the importance of psychosocial support for children with severe rare diseases and their siblings. Thus, somatic treatment should ideally go hand in hand with individually tailored psychosocial interventions.

Conclusions

The results contribute to the existent research by demonstrating that HRQoL and mental health in children and adolescents with rare diseases resulting in technological dependency in the progression of the disease may be negatively impacted, especially regarding social and emotional aspects with medium to high effects. Therefore, social deficits and peer problems may best be targeted in specific programs that teach social skills and foster prosocial behavior and peer relationships, reducing loneliness by improving social acceptance. Regarding the assessment of HRQoL and mental health, both self-report and parent reports should be obtained whenever possible. Finally, this study highlights the importance of the psychosocial assessment of siblings in families with a child diagnosed with a rare disease.

Availability of data and materials

The datasets generated during the current study are available from the corresponding author (JB) on reasonable request.

Abbreviations

HRQOL:

Health-related Quality of Life

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Acknowledgements

A particular thank you goes to all the families who participated.

Funding

Open Access funding enabled and organized by Projekt DEAL. This research was funded by the Werner Otto Foundation. The funders had no role in the design of the study; the collection, analyses, or interpretation of data; the writing of the manuscript, or the decision to publish the results.

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Authors and Affiliations

Authors

Contributions

SWG, JD, BG, AD, and KW are the principal investigators of the study. SWG, LM, JJ, JD and KW developed the study concept and the design. SWG, LM, and BG developed the study materials, and LM acquired the data. SWG, AL, CB, JD, JJ, AD, KW, and JB analyzed and interpreted the data. SWG, AL, AH, ACN, JD, JJ, CB, and JB wrote the first draft of the manuscript. All authors have revised the subsequent drafts critically, approved the final manuscript to be published, and agreed to be accountable for all aspects of the work. All authors read and approved the final manuscript.

Corresponding authors

Correspondence to Silke Wiegand-Grefe or Johannes Boettcher.

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Ethics approval and consent to participate

The study was carried out according to the Declaration of Helsinki and was approved by the Medical Chamber Hamburg (PV 4361). Signed informed consent was provided by the parents and, if possible, additionally by the patients and siblings themselves. Participants could withdraw from the study at any time.

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Not applicable.

Competing interests

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

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Wiegand-Grefe, S., Liedtke, A., Morgenstern, L. et al. Health-Related Quality of Life and mental health of families with children and adolescents affected by rare diseases and high disease burden: the perspective of affected children and their siblings. BMC Pediatr 22, 596 (2022). https://doi.org/10.1186/s12887-022-03663-x

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Keywords

  • Health-Related Quality of Life
  • Mental health
  • Technologically dependent
  • Siblings