Table 1.
Outcomes of 551 births from pregnancies to mothers residing in the extra-urban area (study group) and of 22 342 births from pregnancies to Sicilian women residing in similar low population density, low industrialisation areas (comparison group), conceived between 36 weeks before and 4 weeks after 29 July, 2012
| Birth outcome | Extra-urban exposed area | Comparison group | Unadjusted OR | Adjusted OR | ||
| N (%) | N (%) | |||||
| All births | 551 (100) | 22 342 (100) | OR | (95% CI) | OR** | (95% CI) |
| Gender | 7 (0,03)* | |||||
| Male | 299 (54.26) | 11 464 (51.31) | 1 (ref.) | 1 (ref.) | ||
| Female | 252 (45.74) | 10 871 (48.66) | 0.89 | (0.75–1.05) | 0.8 | (0.75–1.05) |
| Plurality | ||||||
| Singleton birth | 530 (96.19) | 21 594 (96.65) | 1 (ref.) | 1 (ref.) | ||
| Multiple birth | 21 (3.81) | 748 (3.35) | 1.14 | (0.73–1.78) | 1.17 | (0.75–1.82) |
| Status at birth | 13 (0,06)* | |||||
| Live births | 548 (99.46) | 22 264 (99.65) | 1 (ref.) | 1 (ref.) | ||
| Stillbirths | 3 (0.54) | 65 (0.29) | 1.88 | (0.59–5.98) | 1.89 | (0.59–6.03) |
| Singleton live births | 530 (100) | 21 525 (100) | OR | (95% CI) | OR** | (95% CI) |
| Preterm | ||||||
| (<37 weeks) | 36 (6.82) | 1094 (5.13) | 1.35 | (0.96–1.91) | 1.35 | (0.96–1.90) |
| Very preterm | ||||||
| (<32 weeks) | 8 (1.52) | 144 (0.68) | 2.26 | (1.10–4.63) | 2.29 | (1.12–4.68) |
| Low birth weight | ||||||
| (<2.500 gr) | 37 (6.99) | 1143 (5.31) | 1.34 | (0.95–1.88) | 1.36 | (0.97–1.91) |
| Very low birth weight (<1500 gr) |
7 (1.32) | 131 (0.61) | 2.19 | (1.02–4.71) | 2.20 | (1.02–4.72) |
| Small for gestational age | 15 (2.84) | 578 (2.71) | 1.05 | (0.62–1.76) | 1.07 | (0.65–1.80) |
*Number and percentage of non-missing values **OR adjusted for maternal age and infant gender (OR contrasting male and female gender adjusted for maternal age, only).