Table 2.
Summary of the characteristics of the included studies for the comparison of serum 25-hydroxyvitamin D (25(OH)D) levels between AD patients and healthy controls.
| Study | Year | Study Population | Study Size | Location |
|---|---|---|---|---|
| Samochocki et al. [12] | 2013 | Adults aged 18–50 years (mean age: 29.9 years) | 95 cases, 58 control subjects | Poland |
| El Taieb et al. [13] | 2013 | Children aged 2–12 years (mean age, AD group: 6.2 years, control group: 6.5 years) | 29 cases, 30 control subjects | Egypt |
| Noh et al. [14] | 2014 | All ages (mean age, AD group: 20.8 years, control group: 29.5 years) | 82 cases, 49 control subjects | Korea |
| Wang et al. [15] | 2014 | Children (mean age: 15.5 years, control group: 12.3 years) | 498 cases, 328 control subjects | Hong Kong |
| Cheon et al. [16] | 2015 | Children (median age, AD group: 6 years, control group: 6 years) | 91 cases, 32 control subjects | Korea |
| Han et al. [17] | 2015 | All ages (adult group aged 18–51 years, pediatric group aged 12 months–16 years) | 72 cases, 140 control subjects | Korea |
| Di Filippo et al. [18] | 2015 | Children (mean age, AD and control groups: 4 years) | 39 cases, 20 control subjects | Italy |