Table 4.
Predictors of SARS-CoV-2 infection in a subgroup of the population at risk (N = 1265)
| Hazard ratio (95% CI) for SARS-CoV-2 infection | |||
|---|---|---|---|
| Proportional hazards modela | Period-rate modelb | ||
| Age | /year | 0.98 (0.98–0.99) | 0.98 (0.97–0.99) |
| Gender | Male | 0.93 (0.71–1.23) | 0.91 (0.68–1.22) |
| Ethnicityc | Asian/other | 1.33 (0.92–1.91) | 1.36 (0.93–1.98) |
| Black | 1.70 (1.15–2.50) | 1.78 (1.18–2.66) | |
| Diabetes | 1.48 (1.12–1.97) | 1.53 (1.14–2.07) | |
| Prior SARS-CoV-2d | 0.62 (0.45–0.84) | 0.60 (0.44–0.82) | |
| Vaccinatione | One | 0.79 (0.38–1.64) | 0.81 (0.37–1.80) |
| Two | 0.59 (0.36–0.97) | 0.52 (0.31–0.89) | |
| Three | 0.48 (0.31–0.75) | 0.46 (0.28–0.75) | |
| Three (ref Two) | 0.80 (0.57–1.14) | 0.88 (0.61–1.28) | |
| Vaccination (per dose)f | 0.78 (0.68–0.90) | 0.78 (0.67–0.91) | |
| Vaccination (months since)g | 1.04 (1.00–1.09) | 1.04 (0.98–1.09) | |
a
Cox proportional hazards model censored for transplantation, death, or transfer to another center.
b
Period-rate model using 2-week intervals with dialysis unit as random effect.
c
Reference ethnicity White.
d
PCR positive at least 90 days prior to the current infection.
e
Vaccination reference group: none (unvaccinated) except where stated.
f
Vaccination as number of doses (linear effect, 0 = unvaccinated).
g
Vaccination as time since last vaccine dose (unvaccinated excluded).
Vaccination status considered to change after the 7th post dose day.
Boldface indicates confidence interval not including 1.