Table 4.
The adjusted association between a one interquartile range increase in air temperature (°C) and PM2.5 and birth weight for full-term births at various exposure periods (n = 453,658).
| Exposure period | Predicted air temperature (°C)β (95% CI) | Closest monitor temperature (°C)β (95% CI) |
|---|---|---|
| Day of birth | –3.6 (–8.1, 0.9) | 0.6 (–4.8, 6.0) |
| One day before birth | –4.4 (–9.6, 0.7) | 1.8 (–3.8, 7.5) |
| Moving average of 3 days before birth | –4.1 (–9.8, 1.5) | 3.0 (–2.8, 8.8) |
| Last week (7 days before birth) | –8.9 (–16.2, –1.5) | 1.5 (–4.6, 7.7) |
| Last 2 weeks (14 days before birth) | –15.5 (–24.2, –6.8) | 0.5 (–6.4, 7.3) |
| Last month (30 days before birth) | –16.6 (–27.4, –5.9) | 2.0 (–6.3, 10.2) |
| Last trimester | –16.7 (–29.7, –3.7) | –8.0 (–20.3, 4.3) |
| Entire pregnancy | –5.0 (–7.8, –2.3) | 2.6 (–17.1, 22.4) |
| All models adjusted for predicted air temperature, predicted PM2.5, cumulative traffic density, percent of open spaces, age of mother, gestational age, chronic conditions of mother or conditions of pregnancy (lung disease, hypertension, gestational diabetes, or nongestational diabetes), parity, previous infant weighing ≥ 4,000 g and sex of infant, sine and cosine (controlling for seasonality), APNCU (as a categorical variable), mother’s race (as a categorical variable), mother’s education (as a categorical variable), and previous preterm occurrences. | ||