Table II.

Comparisons of reproductive outcomes before and after propensity score matching (PSM).

	Before PSM					After PSM
	Vaccinated n = 502	Unvaccinated n = 1589	P	aOR (95% CI)	P	Vaccinated n = 492	Unvaccinated n = 1263	P	aOR (95% CI)	P
Live birth	43.6% (219/502)	45.0% (715/1589)	0.590	1.045 (0.844–1.293)	0.689	42.9% (211/492)	43.9% (555/1263)	0.688	0.984 (0.792–1.223)	0.887
Ongoing pregnancy	48.2% (242/502)	48.1% (765/1589)	0.980	1.111 (0.893–1.383)	0.343	52.2% (257/492)	52.7% (665/1263)	0.875	0.983 (0.798–1.211)	0.875
Clinical pregnancy	55.0% (276/502)	54.8% (870/1589)	0.928	1.135 (0.910–1.414)	0.262	54.7% (269/492)	54.2% (685/1263)	0.868	1.018 (0.826–1.255)	0.868
Biochemical pregnancy	61.2% (307/502)	59.0% (937/1589)	0.384	1.268 (1.012–1.589)	0.039	61.0% (300/492)	58.3% (736/1263)	0.301	1.119 (0.904–1.384)	0.301
Biochemical pregnancy loss	10.1% (31/307)	7.2% (67/937)	0.096	1.537 (0.944–2.502)	0.084	10.0% (30/300)	6.7% (49/736)	0.066	1.558 (0.968–2.507)	0.068
Early miscarriage	11.1% (34/307)	11.2% (105/937)	0.927	1.003 (0.643–1.563)	0.99	11.3% (34/300)	11.4% (84/736)	0.971	0.992 (0.650–1.515)	0.971
Ectopic pregnancy	0.3% (1/307)	0.2% (2/937)	0.573#	NA		0.3% (1/300)	0.3% (2/736)	1.000#	NA
Newborns’ birth height (cm)	50.0 ± 1.6	49. 0 ± 2.9	0.116	NA		49.9 ± 1.7	49.3 ± 2.6	0.141	NA
Newborns’ birth weight (g)	3111.2 ± 349.9	3030.3 ± 588.5	0.544	NA		3053.8 ± 372.5	3039.2 ± 496.8	0.347	NA

^#Fisher exact test. aOR, adjusted odds ratio; NA, not available/applicable.