| N | PM10 exposure (μg/m3) Mean (SD) | NO2 exposure (μg/m3) Mean (SD) |
---|---|---|---|
Child characteristics | Â | Â | Â |
Gestational age at birth | Â | Â | Â |
< 37 weeks | 463 | 30.4 (3.3) | 40.0 (4.5) |
37-42 weeks (Reference) | 6871 | 30.2 (3.1) | 39.7 (4.2) |
< 42 weeks | 556 | 30.1 (3.3) | 39.7 (4.1) |
Birth weight | Â | Â | Â |
< 2500 grams | 359 | 30.4 (3.1) | 40.0 (4.4) |
2500-4500 grams (Reference) | 7194 | 30.2 (3.2) | 39.7 (4.2) |
> 4500 grams | 337 | 30.0 (3.2) | 39.6 (4.3) |
Season of birth | Â | Â | Â |
Winter (Reference) | 1856 | 29.7 (2.7) | 38.9 (4.1) |
Spring | 1781 | 30.4 (2.3) ** | 41.0 (3.8) ** |
Summer | 2098 | 30.5 (3.4) ** | 40.4 (4.0) ** |
Fall | 2155 | 30.0 (3.8) | 38.7 (4.5) |
Year of birth | Â | Â | Â |
2002 (Reference) | 696 | 33.6 (1.7) | 39.6 (3.5) |
2003 | 2406 | 33.2 (1.6) ** | 41.9 (3.9) ** |
2004 | 2548 | 27.6 (2.4) ** | 39.0 (4.2) * |
2005 | 2214 | 28.8 (1.5) ** | 38.3 (3.9) ** |
2006 | 26 | 27.8 (1.3) ** | 36.8 (4.1) * |