. 2016 Jul 1;11(7):e0158536. doi: 10.1371/journal.pone.0158536

Table 3. Hazard ratios for the association between vitamin D status and long-term all-cause mortality before and after adjusting for confounders.

Vitamin D status	No. of patients (%) (n = 241)	Crude HR (95% CI)	Adjusted HR (95% CI)^a
Vitamin D ≥50 nmol/L	73 (30.3)	Reference	Reference
Vitamin D 30–49 nmol/L^b	81 (33.6)	1.13 (0.61–2.09)	0.80 (0.42–1.52)
Vitamin D <30 nmol/L^b	87 (36.0)	1.56 (0.88–2.76)	1.91 (1.06–3.45)

Abbreviations: Vitamin D, 25-hydroxyvitamin D; HR, hazard ratio; CI, confidence interval.

^b HRs after adjustment for age, COPD, immunocompromization and season.

^a Compares patients with 25-hydroxyvitamin D levels between 30–49 nmol/L or <30 nmol/L to patients with 25-hydroxyvitamin D levels ≥50 nmol/L (reference category).