Table 1. Population characteristics.
| Mean(±SD) / n(%) | n | |
|---|---|---|
| Demographic Characteristics | ||
| Gestational age, weeks | 39.8 (±1.1) | 278 |
| Air pollution exposure | ||
| Outdoor | ||
| Mean PM10, last 14 days before delivery, μg/m3 | 18.4 (±8.0) | 278 |
| Mean PM10, last 30 days before delivery, μg/m3 | 19.1 (±7.1) | 278 |
| Mean PM10, third trimester of pregnancy, μg/m3 | 19.1 (±5.3) | 278 |
| Mean NO2, last 14 days before delivery, μg/m3 | 18.5 (±7.4) | 265 |
| Mean NO2, last 30 days before delivery, μg/m3 | 18.5 (±7.4) | 265 |
| Mean NO2, third trimester of pregnancy, μg/m3 | 18.5 (±7.2) | 265 |
| Distance to major roads, m | 327 (±484) | 276 |
| Indoor | ||
| Maternal smoking during pregnancy, yes | 25 (9%) | 278 |
| Passive smoking during pregnancy, yes | 53 (19.1%) | 277 |
| Hereditary Factors | ||
| Sex, male | 153 (55%) | 278 |
| Maternal atopy, yes | 94 (33.8%) | 278 |
| Perinatal Factors | ||
| Mode of delivery, cesarean section | 42 (15.1%) | 278 |
| Pathological CTG, yes | 27 (9.7%) | 278 |
| Meconium within amniotic fluid, yes | 37 (13.4%) | 277 |
| Older siblings, yes | 169 (60.8%) | 278 |
| Premature rupture of the fetal membranes, yes | 16 (5.9%) | 270 |
Abbreviations: PM10, Particulate matter <10 μm in diameter; NO2, nitrogen dioxide; CTG, Cardiotocogramm