Journal List > Allergy Asthma Respir Dis > v.3(3) > 1059100

Hwang, Choi, Kim, Choi, and Sung: Correlation between serum 25-hydroxyvitamin D3 and the severity of atopic dermatitis in children with allergic or nonallergenic sensitization

Abstract

Purpose

The aim of this study was to assess the relationship between serum 25-hydroxyvitamin D3 levels and the severity of atopic dermatitis (AD), markers of atopy (total IgE, total eosinophil count, and eosinophil cationic protein) in AD children according to allergen sensitization.

Methods

This cross-sectional study was carried out on 160 AD patients aged 1 to 18 years between March 2012 and August 2014. The AD patients (AD group) were subdivided into 2 categories according to the results of the allergic skin prick and Unicap tests: the allergic and nonallergic AD groups. We compared 25-hydroxyvitamin D3 levels between the AD and control groups. We also investigated relationships between serum 25-hydroxyvitamin D3 levels, the severity of AD, and markers of AD (total IgE, total eosinophil count, and eosinophil cationic protein) in the allergic and nonallergic AD groups.

Results

The average 25-hydroxyvitamin D3 levels were 30.6±11.7 and 23.7±10.0 ng/mL, respectively, in the control and AD groups (P<0.001). The average 25-hydroxyvitamin D3 levels were 19.7±8.6 and 27.5±9.8 ng/mL, respectively, in the allergic and nonallergic AD groups, with clinical implications (P<0.001). The 25-hydroxyvitamin D3 levels were not significantly associated with SCORing Atopic Dermatitis index in the allergic (P=0.004, r=-0.092) or nonallergic (P=0.610, r=-0.58) AD groups. The 25-hydroxyvitamin D3 levels were not significantly associated with the aforementioned markers of atopy in the AD group.

Conclusion

These results suggest that 25-hydroxyvitamin D3 may play a role in the pathogenesis of AD.

Figures and Tables

Fig. 1

Number of children who were eligible for the study.

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Fig. 2

The 25-hydroxyvitamin D3 levels of allergen and nonallergen patients according to the severity of atopic dermatitis.

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Table 1

Comparison of characteristics in the study subjects

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Variable Control (n=150) Atopic dermatitis P-value
Allergen (+) (n = 80) Allergen (-) (n = 80) Total (n = 160) P-value*
Boy 61 (40.7) 34 (50.0) 43 (37.5) 70 (43.8) 0.111 0.583
Age (yr) 4.0 ± 4.2 (1-18) 5.8 ± 4.6 (1-17) 3.9 ± 3.3 (1-17) 4.9 ± 4.1 (1-17) 0.003 0.076

Values are presented as number (%) or mean±standard deviation (range).

*Allergen (-) compared with allergen (+). Control compared with atopic dermatitis.

Table 2

Comparison of SCORAD index and atopic markers in atopic dermatitis patients

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Variable Atopic dermatitis P-value
Allergen (+) (n = 80) Allergen (-) (n = 80) Total (n = 160)
SCORAD index 36.5±20.3 29.9±17.3 33.21±19.07 0.028
Severity 80 (100) 80 (100) 160 (100) 0.128
 Mild 15 (18.8) 19 (23.8) 34 (21.2)
 Moderate 33 (41.2) 41 (51.2) 74 (46.3)
 Severe 32 (40.0) 20 (25.0) 52 (32.5)
Total IgE (IU/mL) 818.0±986.7 74.0±157.9 - <0.001
ECP (µg/L) 16.5±16.7 14.6±18.8 - 0.502
Total eosinophil count (/µL) 580.6±563.5 356.0±224.2 - 0.001

Values are presented as mean±standard deviation or number (%).

SCORAD, SCORing Atopic Dermatitis; ECP, eosinophil cationic protein.

Table 3

The 25-hydroxyvitamin D3 levels in the study subjects

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Variable Control (n=150) Atopic dermatitis P-value
Allergen (+) (n = 80) Allergen (-) (n = 80) Total (n = 160) P-value*
25-Hydroxyvitamin D3 (ng/mL) 30.6 ± 11.7 19.7 ± 8.6 27.5 ± 9.8 23.7 ± 10.0 <0.001 <0.001
Vitamin D status 150 (100) 80 (100) 80 (100) 160 (100) <0.001 <0.001
Sufficient (≥30) 86 (57.4) 8 (10.0) 30 (37.5) 38 (23.7)
Insufficient (20-29.9) 35 (23.3) 32 (40.0) 28 (35.0) 60 (37.5)
Deficient (<20) 29 (19.3) 40 (50.0) 22 (27.5) 62 (38.8)

Values are presented as mean±standard deviation or number (%).

*Allergen (-) compared with allergen (+). Control compared with atopic dermatitis.

Table 4

The 25-hydroxyvitamin D3 levels according to age in the study subjects

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Age (yr) Control (n=150) Atopic dermatitis (n=160) P-value
No. (%) 25-Hydroxyvitamin D3 No. (%) 25-Hydroxyvitamin D3
1-5 118 (78.7) 33.81 ± 11.61 112 (70.0) 26.18 ± 9.43 < 0.001
6-10 15 (10.0) 24.00 ± 12.17 22 (13.8) 22.23 ± 9.52 0.021
11 17 (11.3) 18.69 ± 13.89 26 (16.2) 14.07 ± 5.97 0.001

Values are presented as mean±standard deviation unless otherwise indicated.

Table 5

Relation between 25-hydroxyvitamin D3 levels and factors in atopic dermatitis patients with or without allergen

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Factor Allergen (+) Allergen (-)
Correlation (r) P-value Correlation (r) P-value
SCORAD Index -0.092 0.004 -0.058 0.610
Total IgE (IU/mL) -0.204 0.069 -0.109 0.337
ECP (µg/L) -0.092 0.419 0.081 0.476
Total eosinophil count (/µL) -0.138 0.222 0.106 0.348

SCORAD, SCORing Atopic Dermatitis; ECP, eosinophil cationic protein.

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