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Table 1 25(OH) D concentration in children aged 0–18 years old

From: Association of serum 25-Hydroxyvitamin D with Vitamin D intervention and outdoor activity among children in North China: an observational study

  N (%) 25(OH) D (ng/mL) P value
Total 55,925 26.13 ± 12.30  
Gender    < 0.001
 Boys 30,683 (54.86) 26.42 ± 12.07  
 Girls 25,241 (45.13) 25.78 ± 12.56  
Age (year)    < 0.001
 0 < age < 1 11,953 (21.37) 33.25 ± 13.64  
 1 ≤ age < 3 14,901 (26.64) 30.71 ± 11.44  
 3 ≤ age < 6 13,124 (23.47) 23.74 ± 9.37  
 6 ≤ age < 12 12,416 (22.20) 19.12 ± 8.70  
 12 ≤ age < 18 3531 (6.31) 16.24 ± 8.30  
Season    < 0.001
 Spring 15,795 (28.24) 25.98 ± 11.77  
 Summer 17,421 (31.15) 26.58 ± 13.07  
 Autumn 10,205 (18.25) 26.51 ± 12.08  
 Winter 12,504 (22.36) 25.37 ± 11.95  
Ethnic    0.050
 Han 54,967 (98.29) 26.12 ± 12.29  
 Ethnic minorities in China 958 (1.71) 26.91 ± 12.67  
Outdoor time    < 0.001
  < 30 min/d 19,929 (35.63) 21.61 ± 11.81  
 30–60 min/d 17,867 (31.95) 27.65 ± 11.47  
  > 60 min/d 18,129 (32.42) 29.60 ± 12.11  
BMI for age    < 0.001
 Normal 51,294 (91.72) 26.58 ± 12.26  
 Overweight 2851 (5.10) 21.84 ± 12.43  
 Obesity 1780 (3.18) 20.07 ± 9.90  
Intervention    < 0.001
 None 28,328 (50.65) 20.60 ± 8.65  
 Supplementation intervention 18,383 (32.87) 29.80 ± 9.49  
 Therapeutic intervention 9214 (16.48) 35.80 ± 17.14  
  1. NOTE: P < 0.05 shows a significant difference between the groups