Table 3.

Infection rates and adjusted HRs for PCR-positive infection after the first dose of either vaccine, by days since vaccination (primary analysis)

	Person-days at risk	PCR tests	PCR testing rate per 1000 person-days	Infection events	Infection rate per 10 000 person-days	Adjusted HR (95% CI)	p value
Unvaccinated	338 003	15 392	45·54	723	21·39	1 (ref)	..
0–6 days	47 591	2482	52·15	105	22·06	0·64 (0·38–1·06)	0·083
7–13 days	53 511	3189	59·60	139	25·98	0·83 (0·54–1·28)	0·404
14–20 days	50 362	2462	48·89	132	26·21	0·96 (0·57–1·60)	0·866
21–27 days	47 514	2478	52·15	95	19·99	0·92 (0·53–1·59)	0·762
28–34 days	43 136	2078	48·17	42	9·74	0·44 (0·24–0·81)	0·0087
35–48 days	63 012	4681	74·29	59	9·36	0·38 (0·19–0·77)	0·0069
≥49 days	27 499	3590	130·55	40	14·55	0·49 (0·20–1·17)	0·108
Overall	670 628	36 352	54·21	1335	19·91	..	..

Adjusted HRs were estimated using Cox proportional hazards regression according to days since the first vaccine dose; the comparator was the unvaccinated group. HRs are adjusted for age, sex, local monthly infection incidence, and long-term care facility bed capacity. 95% CIs were calculated using robust standard errors for long-term care facility-level effects. HR=hazard ratio.