TABLE 3.

Effect of vitamin D on time to first and second exacerbations and time to first hospitalization¹

	HR (95% CI)	P value
Time to first exacerbation
Intention-to-treat population (n = 155)	1.01 (0.67, 1.54)	0.93
Subgroup ≤25 nmol/L (n = 31)	0.55 (0.13, 2.30)	0.41
Time to second exacerbation
Intention-to-treat population (n = 155)	0.80 (0.44, 1.43)	0.44
Subgroup ≤25 nmol/L (n = 31)	2.00 (0.24, 16.22)	0.52
Time to first hospitalization
Intention-to-treat population (n = 155)	1.03 (0.51, 2.07)	0.93
Subgroup ≤25 nmol/L (n = 31)	1.09 (0.17, 7.01)	0.92

¹Results were based on Cox regression analyses. All analyses were adjusted for stratification group and study center. HR, Hazard ratio; CI, confidence interval