Table 3.

Summary of associations between vitamin D status and hospitalization, both cohorts

Variable of interest	Primary cohort		Validation cohort
	OR (95% CI)	P value	OR (95% CI)	P value
Serum 25(OH)D < 50 nmol/L	2.22 (1.93-2.53)	<0.005	2.16 (1.83-2.54)	<0.005
Serum 25(OH)D < 50 nmol/L, adjusted	2.40 (2.10-2.74)	<0.005	2.33 (1.98-2.74)	<0.005
Serum 25(OH)D < 25 nmol/L	3.77 (3.30-4.30)	<0.005	3.36 (2.89-3.92)	<0.005
Serum 25(OH)D < 25 nmol/L, adjusted	3.57 (3.12-4.08)	<0.005	2.98 (2.55-3.49)	<0.005

Where odds ratios have been adjusted, these have been adjusted for age, sex, and whether serum 25(OH)D measurement was carried out in UK spring/summer months (March through August).

Abbreviations: 25(OH)D, 25-hydroxyvitamin D; OR, odds ratio.