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Table 1 Characteristics of study sample and distribution of serum 25 (OH) D

From: High prevalence of vitamin D deficiency among children aged 1 month to 16 years in Hangzhou, China

  Mean+/-
SD(nmol/L)
P value < 25 nmol/L,% (95%CI) < 50 nmol/L,% (95%CI) < 75 nmol/L,% (95%CI)
0-1y stage (infancy)      
Total (n = 2116) 98.7 ± 47.1   0.4 (NC) 5.4 (4.4-6.4) 33.6 (31.6-35.6)
Gender   0.763    
Male (n = 1221) 98.5 ± 47.0   0.4 (NC) 5.3 (4.0-6.6) 34.3 (31.6-37.0)
Female (n = 895) 99.1 ± 47.2   0.3 (NC) 5.5 (4.0-7.0) 32.7 (29.6-35.8)
2-5y stage (preschool)      
Total (n = 2269) 69.6 ± 30.4   1.1 (NC) 21.9 (20.2-23.6) 68.6 (66.7-70.5)
Gender   0.108    
Male (n = 1454) 70.4 ± 31.4   1.2 (NC) 20.8 (18.7-22.9) 67.7 (65.3-70.1)
Female (n = 815) 68.2 ± 28.6   1.1 (NC) 24.0 (21-27) 70.1 (67.0-73.2)
6-11y stage (school age)      
Total (n = 1440) 56.1 ± 19.9   2.0 (NC) 40.4 (37.9-42.9) 88.3 (86.6-90.0)
Gender   0.969    
Male (n = 1019) 56.1 ± 18.7   1.6 (NC) 39.1 (36.1-42.1) 88.8 (86.9-90.7)
Female (n = 421) 56.1 ± 22.6   3.1 (NC) 43.7 (39.0-48.4) 86.9 (83.7-90.1)
12-16y stage(adolescence)      
Total (n = 183) 52.1 ± 17.0   3.3 (NC) 46.4 (39.2-53.6) 89.6 (85.2-94.0)
Gender   0.051    
Male (n = 135) 53.5 ± 17.0   2.2 (NC) 44.4 (36-52.8) 88.1 (82.6-93.6)
Female (n = 48) 48.0 ± 16.6   6.3 (NC) 52.1 (38-66.2) 93.8 (87.6-100)
  1. CI indicates confidence intervals and NC indicates not calculable (n < 30 observations).