Table 3.
Adjusteda regression coefficientsb for change in gestational age (days) due to maternal exposure to HI90, HI95, and HI99 episodes during lags of 0–6 days, Barcelona City, 2001–2005.
| HI90 | HI95 | HI99 | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Lag | No. of exposed subjects | Regression coefficient (95% CI) | p-Value | No. of exposed subjects | Regression coefficient (95% CI) | p-Value | No. of exposed subjects | Regression coefficient (95% CI) | p-Value | |||||||||
| 0 | 492 | –0.7 (–1.9 to 0.6) | 0.29 | 222 | –0.2 (–0.4 to –0.1) | < 0.01 | 25 | –1.1 (–6.3 to 4.1) | 0.68 | |||||||||
| 1 | 482 | –0.9 (–2.1 to 0.4) | 0.17 | 221 | –1.6 (–3.5 to 0.2) | 0.08 | 30 | –5.3 (–10.1 to –0.5) | 0.03 | |||||||||
| 2 | 690 | –1.0 (–2.1 to 0.0) | 0.06 | 227 | –1.2 (–3.1 to 0.6) | 0.19 | 29 | –1.7 (–3.5 to 6.9) | 0.53 | |||||||||
| 3 | 500 | –0.8 (–2.1 to 0.4) | 0.18 | 215 | 0.4 (–1.6 to 2.4) | 0.71 | 27 | –3.2 (–8.3 to 2.0) | 0.23 | |||||||||
| 4 | 491 | 0.2 (–1.0 to 1.5) | 0.70 | 226 | 0.2 (–1.7 to 2.1) | 0.84 | 37 | –1.0 (–5.3 to 3.3) | 0.65 | |||||||||
| 5 | 508 | 0.1 (–1.2 to 1.3) | 0.93 | 233 | 0.1 (–1.8 to 2.1) | 0.91 | 36 | –0.4 (–4.8 to 4.1) | 0.87 | |||||||||
| 6 | 502 | –0.1 (–1.4 to 1.1) | 0.82 | 205 | 0.8 (–1.2 to 2.7) | 0.43 | 37 | 1.3 (–3.7 to 6.3) | 0.61 | |||||||||
| aAdjusted for maternal age, ethnicity, academic level, work status, tobacco smoking, diabetes, infection, history of preterm birth, obstetrical–gynecological pathologies, parity, use of assisted reproductive technique, and infant sex. bEach regression coefficient represents results from a separate regression. | ||||||||||||||||||