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Table 1 Clinical characteristics of the participants

From: Relationship between polymorphisms in vitamin D metabolism-related genes and the risk of rickets in Han Chinese children

Characteristic Mean ± SD
  Case Control
Number 105 401
Male/female 52/53 251/150
Age (years) 1.77 ± 1.07 7.17 ± 3.89
BMI (kg/m2) 18.43 ± 4.21 18.14 ± 3.37
Calcium (mmol/L) 2.33 ± 0.16 2.42 ± 0.13
Phosphate (mmol/L) 1.69 ± 0.24 1.67 ± 0.19
Alkaline phosphatase (IU/L) 207.33 ± 54.64 231.72 ± 69.52
Serum 25(OH)D (ng/ml)a 11.82 ± 6.95 23.58 ± 8.20
Regular vitamin D useb   
Yes 19 193
No 86 208
  1. aSerum collected from November to April, 2010.
  2. bIntake of 400 IU/d.
  3. Significant P values are indicated by a triangle ( P < 0.05).