Table 3.

Multivariable binomial regression matched analysis of COVID-19 related mortality for ARD patients with documented immunomodulatory treatment only. The relative risk presented for the Omicron group compared to the Delta group.

Variable	P value	Relative risk	95% C.I
Female	0.52	0.87	0.56–1.33
Age group*	<0.001	1.69	1.38–2.08
Booster (third vaccination)	<0.001	0.43	0.29–0.66
Hypertension	0.01	2.02	1.16–3.52
Charlson index	<0.001	1.26	1.17–1.34
Prednisone⁎⁎	0.01	1.30	1.11–1.54
Omicron variant	0.01	0.48	0.31–0.75

^⁎Grouped into <50, 50–59, 60–69, 70–79, 80≤.

^⁎⁎Grouped into ≤5 mg, 5–20 mg, >20 mg.