Pregnancy outcomes Total a Unvaccinated N (%) Vaccinated N (%) Crude HR b (95% CI) p-value Adjusted c aHR (95% CI) p-value
Gestational hypertension d 86/1267 (6.7) 10/249 (4.0) 76/1018 (7.4) 1.45 (0.79, 2.66) 0.228 1.24 (0.66, 2.30) 0.497
Preeclampsia d 116/1268 (9.1) 26/250 (10.4) 90/1018 (8.8) 0.77 (0.49, 1.19) 0.246 0.75 (0.47, 1.18) 0.220
Pre-delivery hospitalization due to influenza like illness e 94/1272 (7.3) 24/253 (9.4) 70/1019 (6.8) 0.75 (0.47, 1.21) 0.245 0.84 (0.51, 1.36) 0.488
Preterm premature rupture of the membranes f 42/1272 (3.3) 12/263(4.7) 30/1019 (2.9) 0.83 (0.41, 1.69) 0.616 0.99 (0.47, 2.07) 0.987
Preterm birth f 82/1272 (6.4) 21/253 (8.3) 61/1019 (5.9) 0.95 (0.56, 1.60) 0.852 0.99 (0.57, 1.70) 0.984
Spontaneous preterm birth f 51/1272 (4.0) 14/253 (5.5) 37/1019 (3.6) 0.87 (0.46, 1.67) 0.693 1.01 (0.52, 1.97) 0.961
Birth outcomes
LBW (<2500 g) 71/1268 (5.6) 21/250 (8.4) 50/1018 (4.9) 0.69 (0. 40, 1.19) 0.189 0.72 (0.41, 1.27) 0.261
LBW at term (<2500 g) g 31/1186 (2.6) 8/229 (3.4) 23/957 (2.4) 0.64 (0.28, 1.46) 0.299 0.67 (0.29, 1.55) 0.361
SGA 150/1266 (11.8) 36/249(14.4) 114/1017 (11.2) 0.77 (0.52, 1.15) 0.211 0.80 (0.53, 1.20) 0.295
Difference in means (vaccinated - unvaccinated) Difference in means (vaccinated - unvaccinated) Difference in adjusted means (vaccinated -unvaccinated) Difference in adjusted means (vaccinated -unvaccinated)
Mean birth weight, grams (95% CI) 3368.0 ± 496.2 3313 ± 565.3 3381.2 ± 477.5 68.0 (-3.0, 139.1) 0.061 44.6 (-26.0, 115.3) 0.216
Mean gestational age at delivery, weeks (95% CI) 39.4 ± 1.5 39.2 ± 1.7 39.4 ± 1.4 0.23 (0.01, 0.44) 0.038 0.22 (0.001, 0.44) 0.048