Table 1.

Reference intervals for 25(OH)-vitamin D₃ (ng/ml), males and females

Age	N	2.5%	97.5%
0 to < 3 months	131	5	42
3 to < 6 months	135	9	60
6 months to < 1 year	147	18	58
1 to < 3 years	394	15	54
3 to < 10 years	619	14	46
10 to < 13 years	286	11	50
13 to < 15 years	275	10	44
15 to < 18 years	390	8	45
< 18 years	421	8	56

Conversion factor: 1 ng/ml = 2.5 nmol/l, 1 nmol/l = 0.4 ng/ml.