CI=confidence interval. HR=hazard ratios. LBW=low birthweight. SGA=small for gestational age
a: Denominators differ due to missing data.
b: HR results compared outcome variable in vaccinated group to reference (unvaccinated).
c: Adjustments were made for maternal age, race/ethnicity, education, household income, gravidity, intake of alcohol and recreational drugs, smoking, pre-pregnancy body mass index (continuous), use of multivitamin supplements, estimated season of delivery, Edinburgh Postnatal. Depression Scale (EPDS), The State-Trait Anxiety Inventory (STAI), Perceived Stress Scale (PSS-10), physical activity, infertility treatment, and asthma. Birth outcomes were additionally adjusted for infant’s sex.
d: For hypertensive disorders analysis, women who were vaccinated at or after the gestational age at diagnosis were censored
e: Women admitted to hospital with respiratory tract infection/influenza-like illness were censored at their admission date
f: Women vaccinated at 37 weeks’ or later were censored because they were no longer at risk of preterm birth.
g: Low birthweight at term (< 2500 g and ≥ 37 completed weeks’ gestation at birth).