Table 2.

Univariate and Multivariate Cox Regression Analysis of 25(OH) D Levels, Serum Calcium Tertiles and In-Hospital Mortality in Severe COVID-19 Patients.

		Model 1		Model 2		Model 3
		HR 95% CI	p	HR 95% CI	p	HR 95% CI	p
25 (OH) D	>30 μg/l	1	–	1	–	1	–
	20–29 μg/l	1.26 [0.32–5.04]	0.74	1.41[0.35–, 5.6]	0.62	1.3 [0.3–5.7]	0.73
	10–19 μg/l	3.23 [1.06–9.8]	0.039	3.41 [1.11–10.4]	0.031	2.7 [0.8–9.4]	0.1
	<10 μg/l	4.33 [1.43–13.1]	0.009	5.9 [1.77–19.5]	0.004	6.9 [2.0–24.1]	0.002
Serum CaT	T1 [2.21–2.48] mmol/l	1	–	1	–	1	–
	T2 [2.06–2.20]mmol/l	3.3 [1.12–9.6]	0.03	3.95 [1.34–11.7]	0.013	3.34 [1.03–10.8]	0.045
	T3 [1.49–2.05] mmol/l	5.1 [1.9–13.5]	0.001	5.7 [2.12–15.0]	0.001	6.2 [2.1–18.3]	0.001

25(OH) D: 25-hydroxy vitamin D, Serum CaT: Serum calcium tertiles. Model 1: unadjusted model, Model 2: adjusted for age and sex, Model 3: adjusted for model 2, acute kidney injury, cardiac injury, blood glucose, CRP, NLR, LDH, albumin and total cholesterol. HR: Hazard ratio, 95% CI: 95 % confidence interval.

Bold values are statistically significant at p < 0.05.