Outcome
|
Ta Exposure Category
|
1st trimester
|
2nd trimester
|
3rd trimester
|
---|
tLBW
|
Lowest quartilea
|
0.92 (0.75–1.13)
|
0.94 (0.74–1.18)
|
1.17 (0.92–1.49)
|
Intermediate quartiles
|
Reference
|
Reference
|
Reference
|
Highest quartilea
|
1.03 (0.82–1.31)
|
1.14 (0.92–1.41)
|
1.02 (0.92–1.12)
|
SGA
|
Lowest quartilea
|
1.02 (0.92–1.12)
|
0.95 (0.85–1.06)
|
1.17 (1.05–1.31)
|
Intermediate quartiles
|
Reference
|
Reference
|
Reference
|
Highest quartilea
|
0.82 (0.73–0.92)
|
0.94 (0.85–1.04)
|
0.95 (0.85–1.05)
|
- aExposure quartiles were calculated for each trimester separately. 1st trimester: lowest: < 14.9, Highest: > 24.1. 2nd and 3rd trimesters: lowest: < 15.6, Highest: > 24.7. (All values are in centigrade)
- Ta Average ambient air temperature, tLBW term low birth weight, SGA small for gestational age. Trimester-specific exposures were adjusted for calendar month, year of birth, particulate matter < 2.5 μm (PM2.5), maternal age at birth, gravidity, parity, ethnicity, newborn sex, census-level poverty index and population density, and mutually adjusted for each other