The odds of having received influenza vaccine during pregnancy were lower (a) for black women than for all other ethnic groups (OR = 0.78; 95% CI, 0.62-0.98), (b) for women with diabetes (OR = 0.30, 95% CI, 0.10-0.95), and (c) for mothers who used multivitamins in pregnancy (OR = 0.64; 95% CI, 0.50-0.83) ( Table 1) . Insured women were more likely to have received the influenza vaccine (OR = 1.41; 95% CI, 1.09-1.81). Likelihood of having received an influenza vaccine during pregnancy was not associated with any of the other binary covariates (Table 1) . Similarly, gestational age at first prenatal visit was similar for vaccinated women and unvaccinated women (mean: 5.2 wk versus 5.3 wk; p = 0.23), and maternal weight before pregnancy was similar for vaccine recipients and non-recipients (mean: 68.3 kg versus 68.1 kg; p = 0.88).