Percent change in the risk of death for a 10 µg/m3 increase in PM10 in 14 US cities
| Method | % increase | 95% CI |
|---|---|---|
| *More lags of winter temperature (lags 2–4). | ||
| †Time stratified approach to matching on season and temperature (rounded to the nearest degree Celsius. | ||
| ‡Poisson regression analysis with penalised splines to control for season and weather. | ||
| More winter temperature lags* | ||
| Two stage | 0.39 | 0.23 to 0.56 |
| One stage | 0.32 | 0.19 to 0.46 |
| Time stratified with temperature matching† | ||
| Two stage | 0.39 | 0.19 to 0.58 |
| One stage | 0.53 | 0.34 to 0.72 |
| Poisson regression‡ | 0.40 | 0.18, 0.62 |