Table 3.
Crude and adjusted main perinatal outcomes in vaccinated and non-vaccinated women
| Outcome | No (%) | Odds ratio (95% CI) | Adjusted propensity score† (95% CI) | |||
|---|---|---|---|---|---|---|
| Vaccinated H1N1 (n=7293) | Non-vaccinated H1N1 (n=23 195) | Crude | Multiple logistic regression adjusted* | |||
| Preterm + low birth weight + perinatal mortality | 513 (7.0) | 2160 (9.3) | 0.74 (0.67 to 0.81) | 0.80 (0.72 to 0.89) | 0.79 (0.71 to 0.87) | |
| Preterm (<37 weeks) | 354 (4.9) | 1505 (6.5) | 0.73 (0.65 to 0.83) | 0.79 (0.69 to 0.90) | ||
| Low birth weight | 357 (4.9) | 1606 (6.9) | 0.69 (0.61 to 0.78) | 0.74 (0.65 to 0.83) | ||
| Perinatal mortality | 54 (7.4) | 257 (11.0) | 0.63 (0.46 to 0.86) | 0.68 (0.42 to 1.06) | ||
*Adjusted for number of antenatal visits, level of education, maternal age, income, parity, smoking, and history of pregnancy induced hypertension.
†Propensity score was entered in model as five level dummy variable, both in fifths of probability of vaccination and range of probability, from 0-10% to >40%.