Table 4. IRs of unexpected vaginal bleeding per 100 PYs and HRs with 95% CIs in the first 4 weeks after vaccination (first or second dose), by vaccine type (i.e., Comirnaty versus Spikevax).

cHR, crude HR; aHR, HR adjusted for age.

	Events	PY	IR per 100 PY (95% CI)	cHR (95% CI)	aHR (95% CI)
Postmenopausal (n = 7463)
Comirnaty	91	823	11.1 (9.0–13.6)	Ref	Ref
Spikevax	18	207	8.7 (5.5–13.8)	0.82 (0.49–1.37)	0.95 (0.57–1.59)
Perimenopausal (n = 6617)
Comirnaty	396	672	58.9 (53.4–65.0)	Ref	Ref
Spikevax	99	147	67.3 (55.3–82.0)	1.08 (0.87–1.36)	1.08 (0.87–1.36)
Premenopausal (n = 6592)
Comirnaty	388	660	58.8 (53.5–65.0)	Ref	Ref
Spikevax	98	124	79.3 (65.1–96.7)	1.30 (1.03–1.62)	1.32 (1.05–1.65)