- Research article
- Open Access
Serum 25(OH)D concentrations and atopic diseases at age 10: results from the GINIplus and LISAplus birth cohort studies
BMC Pediatrics volume 14, Article number: 286 (2014)
Vitamin D is well recognized for its role in skeletal health and its involvement in the modulation of the immune system. In the literature, controversial results are reported for atopic diseases. Thus, we investigated the association between vitamin D status and the prevalence of atopic diseases.
Serum 25-hydroxy-vitamin D (25(OH)D) concentrations were measured in a sample of 2815 10-years old children from two German birth cohort studies. Self-reported physician-diagnosed eczema, hay fever or allergic rhinitis, and asthma were used as outcome variables as well as specific IgE positivity against common allergens. We applied logistic regression models, deriving adjusted odds ratio estimates (aOR) and 95% confidence intervals (CI).
For asthma and hay fever or allergic rhinitis, no associations existed with serum 25(OH)D concentrations. We observed a significant positive relationship between serum 25(OH)D levels and eczema at age 10 (aOR = 1.09, CI = 1.01-1.17, per 10 nmol/l increase in serum 25(OH)D levels) and for the lifetime prevalence of eczema (aOR = 1.05, CI = 1.01-1.09). Specific IgE positivity for food allergens (aOR = 1.07, CI = 1.02-1.11) and aeroallergens (aOR = 1.05, CI = 1.01-1.08) at age 10, as well as lifetime prevalence, was significantly related to the vitamin D status.
In this study we found no indication that higher blood 25(OH)D levels are associated with decreased risk for any of the atopic outcomes in children. However, we observed a positive association of serum 25(OH)D concentrations with eczema and detectable specific IgE. Due to the given limitations of our study, the clinical relevance of these findings needs further clarification.
The increasing prevalence of atopic diseases during past decades in many countries led to a large number of studies, establishing life style and environmental factors as risk factors, as well as a genetic predisposition . The biologically most active vitamin D metabolite 1,25(OH)2 vitamin D (calcitriol) is known to affect immune and airway functions, which is the basis of the hypothesis that vitamin D status may be directly linked to asthma and allergic diseases ,. Meanwhile, several reviews have been published summarizing the existing evidence on vitamin D and atopic diseases or asthma -. The reviews highlight the lack of consistent evidence for a causal protective association between vitamin D (i.e. plasma levels as well as supplementary dietary intake) and atopic diseases.
A unique characteristic of vitamin D is that it is mostly produced by the human body after the skin is exposed to sunlight (UVB). Actually, the contribution of vitamin D intake from habitual diet to the overall vitamin D supply is limited, while endogenous synthesis is estimated to contribute up to 90% of the bodie’s vitamin D (e.g. ). The serum concentration of 25-hydroxy-vitamin D (25(OH)D) is an established biomarker for determining vitamin D status (see e.g. ).
Litonjua & Weiss hypothesized that more time is spent indoors and consequently the exposure to sunlight is reduced, leading to vitamin D insufficiency and, given a causal relationship, to more cases of asthma and allergy. Prenatal deficiency of vitamin D may already affect the development of the fetal lung and immune system which could be worsened by a postnatal deficiency of vitamin D . This hypothesis of an association between vitamin D deficiency and higher rates of atopic diseases and allergic sensitization is supported by numerous studies -. In contrast, Wjst & Hyppönen see a positive association of vitamin D with allergic rhinitis in adults, which may be explained by subtle differences in the vitamin D metabolism or sensitivity in allergic patients . This controversial speculation was recently supported by increased risk for food allergy within the first two years in children with high vitamin D levels in cord blood  and a significant inverse association of low serum vitamin D level with eczema prevalence . In this situation, our study aims to contribute to this field of strong scientific interest by analyzing the relationship of serum vitamin D status at the age of ten and the prevalence of atopic diseases at the same age or life-time prevalence of these diseases.
The analysis was based on samples from two German birth cohort studies, namely the German Infant Study on the Influence of Nutrition Intervention plus Air pollution and Genetics on Allergy Development (GINIplus) study and the Influence of Life-style factors on Development of the Immune System and Allergies in East and West Germany plus Air Pollution and Genetics on Allergy Development (LISAplus) study, that were recruited from 1995 to 1998 in Munich and Wesel, and from 1997 to 1999 in Munich, Wesel, Bad Honnef and Leipzig, respectively.
Briefly, participants were recruited in maternity wards, and parents were invited to fill in self-administered questionnaires. Since then, families were regularly contacted, and information on disease outcomes in the children was collected by questionnaires and medical examinations. Within the GINIplus framework, children were allocated to either an interventional study arm or an observational study arm, based on parental history of allergic diseases and consent for intervention. GINI aimed to investigate the allergy-preventive effect of 3 differently hydrolyzed infant formulas compared with a conventional cow’s milk formula in infants at risk for atopy in a randomized and double-blind design. During the strict intervention period of four month, mothers were encouraged to exclusively breast-feed and asked to do this preferably for 6 months. It was left to the mother to introduce the study formula, which was provided until the participating child was 6 months old. Mothers were asked to feed no solid foods during the first four months and weekly diaries were filled out documenting the kind of milk the child was fed. In the LISAplus study children were not preselected on parental history of allergic diseases. The LISA study aimed to investigate immunoglobulin E (IgE)-dependent allergic symptoms or diseases in the first 2 years of life as well as to determine parameters of the immune system’s maturation and activation. Both studies were approved by the local ethical committees (Bavarian Board of Physicians, University of Leipzig, Board of Physicians of North-Rhine-Westphalia), and families gave their informed consent prior to their inclusion in the study.
In the first wave about 6000 newborns were recruited within the GINI study and about 3100 newborns within the LISA study. We analyzed data of 2815 children who participated in the 10 year follow-up and for which at least data on serum 25(OH)D concentration was available. The following data from the 10-year follow-up questionnaire and medical examination was used: measured weight and height, single-parent status, and net equivalent income. The 10-year follow-up medical examinations took place from April 2005 to December 2009. Detailed descriptions of both studies were published elsewhere ,.
When examining the distributions of the covariates from those participating in the questionnaire at age 1 year and in the assessment at age 10 years (questionnaire and the corresponding medical examination, serum vitamin D), we found only slight changes (see Additional file 1). Solely for the distribution of `study’ we found a higher loss of follow-up in the observational arm of GINIplus.
We investigated different atopic diseases, either diagnosed at the age of 10 years, or ever diagnosed since birth. All these outcomes are assessed on the basis of self-administered questionnaires data. For asthma, eczema and hay fever or rhinitis, participants were categorized as `case’s at the age of 10 years if a physician first diagnosed or confirmed the diagnosis of the disease during the last 12 month before the 10 year questionnaire was filled in, thereby not taking into account any information on allergic sensitization. For the definition of `ever’ diagnosis of these diseases information from all questionnaires from birth up to the 10 year follow-up was used (self-reports of physician diagnosed diseases). If at least at one time point a disease was reported the participating child was treated as a case for that outcome.
For definition of allergic sensitization, the serum concentrations of specific IgE antibodies against common inhalant (SX1) or food allergens (FX5) at the age of 6 and 10 years were measured. Children with specific IgE values higher than 0.35 kU/l were regarded as sensitized (Pharmacia CAP System (Pharmacia Diagnostics, Freiburg, Germany). For the definition of `ever’ sensitization, at least one of the two tests for specific IgE, performed at age 6 and 10, must have been positive.
For all outcomes regarding the `ever diagnosis’, to minimize the number of missing observations, the status `missing’ was only assigned when all relevant answers to determine the status were missing. In return, this means that the status `non-diseased control’ was assigned even when one or more answers were missing, as long as no diagnosis by a physician was affirmed.
Determination of serum 25(OH)D concentration
Blood samples were collected at age of 10 years during the clinical examination, centrifuged after collection, and stored frozen at –80° until assayed for vitamin D. Only one measurement per sample was conducted.
Total serum 25(OH)D concentration was determined by Roche Vitamin D total on the fully automated Modular system (E170, Roche Diagnostics, Mannheim, Germany). The specificity is reported by the manufacturer as 25(OH)D2 = 81%; 25(OH)D3 = 98%; 1,25(OH)2D2 = 6%; 1,25(OH)2D3 = 5%; 24,25(OH)2 = 121%, and the lower limit of detection as 3 ng/mL. The intra-assay CV is 2.2-6.8% for sera with levels between 8.35 - 69.6 ng/mL, the inter-assay CV as provided by the manufacturer is 3.4-13.1% for levels between 8.35-69.6 ng/mL.
All analyses were conducted using SAS for Windows, version 9.2 (SAS Institute, Cary, N.C., USA).
It is well known, that the vitamin D status which is assessed best by serum 25(OH)D concentration, strongly depends on sunlight (UVB) exposure which induces the endogenous production of vitamin D in the skin. Therefore, we adjusted the serum 25(OH)D values for date of blood collection by fitting a non-parametric LOESS regression. Our LOESS regression explained the observed serum 25(OH)D value by the date of blood collection. Season-adjusted serum 25(OH)D values were computed by adding the overall mean to the residuals derived from the LOESS regression. The rationale behind this is that the residuals represent the remaining variation of the serum values, whereas the seasonal effect was accounted for by the date of blood collection. Adding the residuals to the overall mean of the serum values yields a well interpretable adjusted variable. These season-adjusted serum 25(OH)D values were introduced as continuous variable in the logistic regression models, or classified in quartiles based on the distribution of the entire cohort, where the first quartile served as reference category.
To assess the association between serum 25(OH)D levels and the atopic disease status we fitted logistic regression models. Minimally adjusted odds ratio estimates were obtained by adjustment for age (continuous), sex, study (GINI observational arm/GINIinterventional arm/LISA), and study location (Munich/Wesel/Bad Honnef/Leipzig). The fully adjusted logistic regression models further included the following variables: breastfeeding (exclusively breastfed/breast and formula fed/exclusively formula fed) during the first four months, child’s BMI (continuous), parental education (categorized as low/medium/high based on the highest number of school years being lower, equal or higher than 10 years), single parent status (yes/no), and parental history of atopic diseases (none/one/both parents).
Whenever the variable sex was identified as an effect modifier, e.g. the interaction term between sex and continuous 25(OH)D serum level was significantly associated with the outcome (p < 0.05), a stratified analysis was performed.
Additionally, we fitted three models comparing those that never suffered from eczema versus those who suffered transiently and those who suffered persistently.
We ran sensitivity analysis examining higher cut-points for the specific IgEs, considering net equivalent income and by performing a complete case analysis to examine a possible influence of missing observations on the definition of the control status of the clinical outcomes.
A sub-analysis was carried out within the framework of the LISAplus study, using the monthly status on vitamin D supplementation available during the first year of life. We extended the models described above by including the main effect of length of supplementation and an interaction term thereof and 25(OH)D serum level. We investigated categories of at least 4, 6 or 12 months of supplementation, respectively.
Descriptive statistics on the 2815 children included in this analysis are shown in the Table 1. Tables 2, 3 and 4 show the results of the fully adjusted models fitted for all clinical and non-clinical outcomes. Results from minimally adjusted models differed only slightly (data not shown). Based on the continuous 25(OH)D variable [per 10 nmol/l] and the adjusted models, vitamin D status was significantly positively associated with the prevalence of eczema at age 10 (aOR = 1.09, CI = 1.01-1.17 per 10nmol/l) as well as with the lifetime prevalence of eczema (aOR = 1.05; CI = 1.01-1.09 per 10 nmol/l). The results of the categorized variable are given in Figure 1. Neither for hay fever, nor for allergic rhinitis an association with vitamin D status was found. For the condensed outcome `hay fever or rhinitis’, no association between disease prevalence and serum 25(OH)D concentration was observed, neither at the age of 10 nor for the lifetime prevalence.
For asthma, no association with vitamin D status was observed. Due to low numbers, neither the study location nor the single-parent status could be taken into account in the gender-specific analysis. Neither in boys nor in girls vitamin D status and asthma were significantly associated.
Regarding allergic sensitization (Table 4), significant associations exist between vitamin D status and specific IgE against food allergens (aOR = 1.07; CI = 1.02-1.11 at the age of 10, aOR = 1.06; CI = 1.02-1.11 for ever sensitization). A similar result was observed for serum concentrations of specific IgE against inhalant allergens: the adjusted OR was 1.05 (CI = 1.01-1.08) at the age of 10 years and aOR = 1.05 (CI = 1.01-1.10) for ever sensitization.
Table 5 shows the results from the additional analysis of eczema. A significant association of vitamin D status at the age of 10 and prevalence of eczema was confirmed by the results of the continuous 25OHD variable only for the persistent cases compared to `non diseased children’ (aOR = 1.09; CI = 1.03-1.16). In both other settings (i.e., early or late transient cases), no significant associations existed.
Considering additionally the net equivalent income, no substantial changes regarding associations of the vitamin D status and the outcomes were observed, even though the sample sizes were reduced. When rising the cut-point of the specific IgE serum concentration values from >0.35 kU/l to >0.7 kU/l for models at age 10, the observed risk estimates did not change materially. However, the association of specific IgE against inhalant allergens and 25(OH)D level dropped below significance level (results not shown).
The sub-analysis considering vitamin D supplementation revealed no effect modification by vitamin D supplementation during the first year of life: neither the main effect nor the interaction term became significant (results not shown). This holds for all outcomes examined, but confounding by socio-economic factors cannot be ruled out.
We investigated associations of 25(OH)D serum levels at the age of 10 and prevalence of asthma, eczema, hay fever or allergic rhinitis, and allergic sensitization. Disease status at age 10 and lifetime prevalence of disease were analyzed as outcomes. We observed small but statistically significant associations of serum 25(OH)D levels and prevalence of eczema as well as the prevalence of allergic sensitization against common food and inhalant allergens.
Published findings regarding an association of vitamin D status and atopic outcomes are not consistent. A comparison of the results to our findings is complicated by differences in the assessment of vitamin D status (e.g. measurements in cord blood or assessment of maternal vitamin D status during pregnancy), in study designs, the age of participants or the definition of the outcomes.
For our finding of a slightly increased prevalence for eczema with high serum 25(OH)D concentrations, only one directly comparable result could be identified that was as well derived in a population based cohort of children and included serum 25(OH)D concentration measurement. This study also found a decreased prevalence of atopic eczema with low serum 25(OH)D concentrations in children aged 0-17 years . Also, a positive association between vitamin D intake and atopic manifestations was described . In a study using cord blood vitamin D levels, no relationship with atopic eczema in children was found , but opposing results were reported by others ,. The link of the severity of atopic dermatitis and vitamin D has been confirmed repeatedly (see e.g.  or more recently ). Benson et al. suggested that the inconsistent connection between vitamin D and allergic skin diseases may be due to a bimodal or gender-specific association ; this is not supported by our results.
We could not confirm any association of serum 25(OH)D concentration and hay fever or allergic rhinitis. Published studies with direct assessment of serum 25(OH)D concentration reported similar null findings (e.g. in a birth cohort ), but as well an increased prevalence of allergic rhinitis across quartiles of 25(OH)D concentrations . Furthermore a marginally significant increase of allergic rhinitis prevalence in the group with highest vitamin D cord blood was reported .
Studies assessing vitamin D status of the mothers or performing measurements in cord blood samples are inconclusive regarding the existence of an association between vitamin D status and risk of asthma -. Significant associations of asthma and vitamin D have been reported by other studies that directly measured serum 25(OH)D concentrations, although the direction of the associations remains inconclusive. For example, associations that change direction with increasing age, from positive to inverse, between serum 25(OH)D levels and prevalence of asthma were reported . Significantly lower serum 25(OH)D levels among the asthmatic cases in a case-control study conducted in Qatar in children  and an inverse association of serum 25(OH)D concentrations and asthma in children  have been published. Low serum 25(OH)D levels at age 6 were reported as significant predictors for asthma-associated phenotypes at age 14 in a birth cohort . Recently, an increased odds of asthma has been reported for low vitamin D levels in children with atopy . Our results show no such association.
Regarding allergic sensitization, we reported a significant positive association of serum 25(OH)D concentrations and specific IgE against common food allergens and against inhalant allergens, respectively. Published results based on direct assessment of serum 25(OH)D concentrations were either supportive of our findings, e.g. , or are contradictory (e.g. ). However, results based on cord blood 25(OH)D concentrations were contradictory ,,. In Asian children aged 5-18 years, no association of serum 25(OH)D status with asthma, rhinitis, eczema, atopy or total serum IgE was found .
Strength and limitations
Measurement of vitamin D status is challenging as results vary strongly with the methods applied . The 25(OH)D levels analyzed in serum samples of children participating in the GINIplus and LISAplus study are considerably higher than reported elsewhere for this age group. This might be due to the assay applied with a comparably low specificity for 25(OH)D and a high cross-reactivity (see Methods section). We used the serum concentration for ranking (in quartiles) and as a continuous variable (p trend). However, we avoided interpretation of serum concentrations in terms of sufficiency of vitamin D supply that requires the application of cut-off values.
Our evaluation is based on serum 25(OH)D concentrations measured in serum samples obtained at one time point, about 10 years after birth. With the applied LOESS regression we controlled adequately on a continuous scale for the seasonal variation in vitamin D status; in other studies often only the date or season of blood collection was included as a confounder in the analysis. All relevant potential confounders were included in the adjusted models.
The cross-sectional analysis at age 10 is suitable to investigate the association of vitamin D status and atopic diseases. Although the occurrence of atopic diseases from birth up to age 10 years (`ever diagnosis’) was included in our evaluation, serum 25(OH)D concentrations were analyzed in serum samples obtained at age 10 years. Thus, reverse causation effects cannot be ruled out (see e.g. ). There is little known about the stability of vitamin D levels in children with a fast changing lifestyle. Our data suggest that the lifetime prevalence of eczema as estimated at the age of 10 years represents predominantly the persistent cases of eczema.
Our analysis of clinical endpoints is based on self-reported physician-based diagnoses and therefore at risk of reporting bias. Furthermore eczema, allergic rhinitis, and asthma are each inexact, clinical diagnoses which might amplify this imprecision. The definition of the `non-diseased control’s as described in the Methods section is debatable. Among the `non-diseased control’s may be cases who missed to report a physician diagnosis. The sensitivity analysis performed included only complete cases in the definition of the control status. This led to a remarkably reduced number of controls. However, no substantial changes regarding the direction of the OR estimates were observed, supporting the validity of the approach taken. We included a non-responder analysis showing that a selective lost for follow up between the study population and the recruited newborns is limited.
Our main findings are a lack of inverse association between serum 25(OH)D concentrations and clinically diagnosed atopic diseases, but a positive association with the prevalence of eczema. The associations were significant for the categorical and continuous variables of vitamin D and eczema. However, we see no dose-response effect. For allergic sensitization we noted a small but statistically significant association. Even though this association has limited clinical relevance, it gives hint on a specific role of vitamin D on pathophysiologically important pathways, especially on the regulation of innate and adaptive immune system as shown in experimental studies (e.g. ). Due to the study design, the results have to be interpreted carefully. Especially, we cannot rule out the possibility of reverse causality.
JH, ET, BS, BH, IL, CPB, S K, AvB, DB participated in designing the study and acquiring or providing the data. JK was responsible for the laboratory analyses. NW carried out the statistical analyses, interpreted the data, and drafted the manuscript. JL and JH designed the current project, supervised the work and contributed to the interpretation of the data. All authors revised the manuscript critically for important intellectual content, and read and approved the final manuscript.
German infant study on the influence of nutrition intervention plus air pollution and genetics on allergy development
Influence of life-style factors on development of the immune system and allergies in east and west germany plus air pollution and genetics on allergy development
25-hydroxy vitamin D
Ultra violet B
Kilo units per liter
Nanomols per liter
Body mass index
Adjusted odds ratio
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The GINIplus study was mainly supported for the first 3 years of the Federal Ministry for Education, Science, Research and Technology (interventional arm) and Helmholtz Zentrum Munich (former GSF) (observational arm). The 4 year, 6 year, and 10 year follow-up examinations of the GINIplus study were covered from the respective budgets of the 5 study centres (Helmholtz Zentrum Munich (former GSF), Research Institute at Marien-Hospital Wesel, LMU Munich, TU Munich and from 6 years onwards also from IUF - Leibniz Research-Institute for Environmental Medicine at the University of Düsseldorf) and a grant from the Federal Ministry for Environment (IUF Düsseldorf, FKZ 20462296). The LISAplus study was mainly supported by grants from the Federal Ministry for Education, Science, Research and Technology and in addition from Helmholtz Zentrum Munich (former GSF), Helmholtz Centre for Environmental Research - UFZ, Leipzig, Research Institute at Marien-Hospital Wesel, Pediatric Practice, Bad Honnef for the first 2 years. The 4 year, 6 year, and 10 year follow-up examinations of the LISAplus study were covered from the respective budgets of the involved partners (Helmholtz Zentrum Munich (former GSF), Helmholtz Centre for Environmental Research - UFZ, Leipzig, Research Institute at Marien-Hospital Wesel, Pediatric Practice, Bad Honnef, IUF – Leibniz-Research Institute for Environmental Medicine at the University of Düsseldorf) and in addition by a grant from the Federal Ministry for Environment (IUF Düsseldorf, FKZ 20462296).
The authors declare that they have no competing interests.
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Additional file 1: Non-responder Analysis. We provide a non-responder analysis, showing the distribution of relevant covariates at different time points. Further covariates included in the analysis (BMI, age, net equivalent income, single parent status) refer to the recording at age 10 not at baseline and are therefore not included in the table. (PDF 298 KB)
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Wawro, N., Heinrich, J., Thiering, E. et al. Serum 25(OH)D concentrations and atopic diseases at age 10: results from the GINIplus and LISAplus birth cohort studies. BMC Pediatr 14, 286 (2014). https://doi.org/10.1186/s12887-014-0286-3
- Atopic diseases
- Allergic rhinitis
- Birth cohort
- Hay fever
- Vitamin D