Table 2.

Logistic regression analysis of COVID-19 cases between the predominance of Alpha and Delta variants in Lleida region (Spain).

	Adjusted odds ratio	95% CI	P-value
Gender female	1.0	Ref. group	–
Gender male	0.9	0.8–0.9	0.001
Age [0–14)	1.0	Ref. group	–
Age [15–34)	0.4	0.4–0.5	< 0.001
Age [35–44)	0.7	0.6–0.8	< 0.001
Age [45–54)	0.9	0.8–0.9	0.007
Age [55–64)	0.9	0.8–1.0	0.2
Age [65–74)	0.8	0.7–0.9	0.04
Age [75–84)	1.2	1.0–1.4	0.02
Age [85–)	2.7	2.2–3.2	< 0.001
Hospitalized	1.0	0.8–1.1	0.7
ICU	1.7	1.1–2.7	0.04
Death	2.7	1.9–4.0	< 0.001
Fever	3.7	3.4–4.0	< 0.001
Cough	4.3	4.0–4.6	< 0.001
Pneumonia	0.8	0.3–1.6	0.5
Sore throat	1.2	1.1–1.2	< 0.001
Shivers	0.9	0.8–1.0	0.1
Dyspnea	1.1	1.0–1.2	0.2
Vomits	2.7	2.4–3.2	< 0.001
Diarrhea	0.3	0.3–0.4	< 0.001
Respiratory distress syndrome	3.0	1.6–6.3	0.001
Acute renal failure	2.9	1.4–7.3	0.03
Cardiovascular disease	1.3	1.1–1.5	0.01
Fully-vaccinated	1.0	Ref. group	–
Half-vaccinated	5.6	3.2–9.2	< 0.001
None-vaccinated	35.7	25.7–51.3	< 0.001

In the logistic regression analysis, the reference category of the dependent variable (Alpha or Delta variant period) was the Delta variant period.

CI Confidence Intervals, Ref. group Reference Group, ICU Intensive Care Unit, RDS Respiratory Distress Symptom.