Table 6.

Regression analysis for risk of ICU admission in SARS-CoV-2-infected elderly patients.

	β for ICU Admission *	(95% CI of β)	Significance
≥70 years (constant) ^	1.93	1.15–3.66	0.020
Covariates (predictors)—pandemic waves
1st pandemic wave	2.12	1.48–4.20	0.004
2nd pandemic wave	1.59	0.92–2.84	0.261
3rd pandemic wave	2.36	1.28–3.78	0.033
4th pandemic wave	2.04	1.13–4.09	0.028
5th pandemic wave	1.33	0.90–1.83	0.402
6th pandemic wave	1.58	0.87–1.96	0.317
Covariates (predictors)—clinical and paraclinical
Confusion	1.92	1.20–2.47	0.001
Dyspnea	3.65	1.46–5.39	<0.001
Decreased WBC	1.09	0.91–1.43	0.063
Decreased lymphocytes	2.11	1.34–3.06	<0.001
Elevated procalcitonin	2.46	1.52–3.88	<0.001
Elevated IL-6	1.96	1.31–2.95	0.001
Elevated CRP	1.13	0.98–1.42	0.051

* Dependent (response) variable; ^ Estimated risk in univariate analysis; CI—Confidence Interval.