Table 4. Multivariate analysis to estimate the risk (odds ratio) of developing a HAI according to vitamin D concentration, expressed in tertiles and adjusted for sex, age, ASA, Charlson index score, and surgery type (emergency vs planned).

	OR	CI (2.5%)	CI (97.5%)	P-value
T1 [8.8,25.5nmol/L]	1	-	-	-
T2 (25.5,43.3 nmol/L]	0.543	0.283	1.025	0.062
T3 (43.3,233 nmol/L]	0.476	0.236	0.94	0.035

Abbreviations: CI, confidence interval; OR, odds ratio; T1, first tertile; T2, second tertile; T3, third tertile.