Table 3.

The Association of SARS-CoV-2 Serology Test Result With COVID-19 Vaccination.

Variable	Univariate HR (95% CI)	Adjusted HR (95% CI)
Negative serology	1.57 (1.44, 1.71)	1.58 (1.45, 1.72)
Age, years
18–29	ref	ref
30–39	1.09 (0.92, 1.28)	1.07 (0.91, 1.26)
40–49	1.17 (1.00, 1.36)	1.16 (0.99, 1.36)
50–64	1.23 (1.06, 1.43)	1.25 (1.08, 1.45)
65–74	1.43 (1.20, 1.69)	1.47 (1.24, 1.75)
75–84	1.37 (1.10, 1.70)	1.47 (1.17, 1.84)
≥85	1.26 (0.84, 1.87)	1.34 (0.89, 2.02)
Sex
Male	ref	ref
Female	0.99 (0.92, 1.07)	1.01 (0.94, 1.09)
Race/ethnicity
Non-Hispanic White	ref	ref
Hispanic	0.85 (0.77, 0.94)	0.94 (0.86, 1.04)
Non-Hispanic Black	1.26 (1.07, 1.47)	1.32 (1.13, 1.54)
Other/mixed	1.01 (0.89, 1.16)	1.07 (0.93, 1.23)
Unknown	1.00 (0.83, 1.21)	1.05 (0.87, 1.27)
Tobacco use
No	ref	ref
Yes	0.82 (0.68, 0.99)	0.79 (0.66, 0.96)
Immunosuppressive conditions
No	ref	ref
Yes	1.08 (0.93, 1.27)	1.04 (0.88, 1.23)
Elixhauser score	1.00 (0.98, 1.02)	0.98 (0.96, 1.01)

HR, hazard ratio.