Table 3.

Multivariable Cox regression model evaluating risk factors for breakthrough SARS-CoV-2 infections.

	Multivariable Analysis* n=1508
Variable	HR (95% C.I.)	p
Antibody levels BAU/mL (log10)	0.51 (0.38-0.69)	<0.001
Age (years)	1.00 (0.96-1.04)	0.94
Sex (Female vs Male)	0.58 (0.26-1.28)	0.18
EDSS (1 point score)	0.94 (0.76-1.17)	0.59
Vaccine (mRNA-1273 vs mRNA BNT162b2)	0.86 (0.29-2.52)	0.94
Previous Covid-19 infection (yes vs no)	0.98 (0.24-4.23)	0.98

HR=Hazard Ratio, C.I.=Confidence Interval, EDSS=Expanded Disability Status Scale.