Table 3.

Relationship between serum 25-OHD and Ca-ab fraction not adjusted for dietary calcium intake

Vitamin D group	Serum 25-OHD range	All subjects	Prepubertal	Early pubertal	Late pubertal
Group 1	28–50 nmol/liter	0.362 ± 0.125 (54)	0.319 ± 0.093 (15)	0.347 ± 0.114 (25)	0.444 ± 0.151 (12)
Group 2	50–80 nmol/liter	0.302 ± 0.092 (154)	0.302 ± 0.090 (44)	0.307 ± 0.092 (88)	0.280 ± 0.097 (22)
Group 3	>80 nmol/liter	0.315 ± 0.100 (233)	0.299 ± 0.092 (125)	0.349 ± 0.105 (84)	0.279 ± 0.088 (24)
P value		0.001	0.72	0.02	0.001

All data shown are fractional Ca-ab (mean ± sd) with sample size given in parentheses. P value is for overall comparison. Subsequent group pairwise comparisons were performed after adjustment by Fisher’s least significant differences for multiple comparisons. Significant pairwise comparisons (P < 0.05) are noted as follows: all subjects: group 1 vs. group 2, P < 0.001, group 1 vs. group 3, P = 0.003; early pubertal: group 2 vs. group 3, P = 0.008; late pubertal: group 1 vs. group 2, P < 0.001, group 1 vs. group 3, P < 0.001.