Table 1 Clinical characteristics of the participants

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 use^b

Yes

19

193^△

No

86

208