Estimating the percentage change in risk (95% CI) per 10 µg/m3 increase in pollutant: single pollutant regression models*
| Daily mean Pollutant | Subtypes of ischaemic stroke | |||
|---|---|---|---|---|
| TACI (number of cases=187), per cent change (95% CI) | PACI (number of cases=520), per cent change (95% CI) | POCI (number of cases=193), per cent change (95% CI) | LACI (number of cases=407), per cent change (95% CI) | |
| Single pollutant regression model | ||||
| PM2.5 | 5.9 (−15.9 to 33.3) | −9.6 (−22.1 to 5.0) | −9.7 (−27.5 to 12.5) | −5.7 (−20.3 to 11.5) |
| PM10 | 2.5 (−12.4 to 19.9) | −4.8 (−13.9 to 5.3) | −7.4 (−20.9 to 8.3) | −4.4 (−14.6 to 7.1) |
| O3 | 3.1 (−9.5 to 17.4) | −1.2 (−8.7 to 6.9) | 5.5 (−6.5 to 18.9) | −4.8 (−12.8 to 4.0) |
| NO2 | −6.2 (−18.8 to 8.4) | −3.6 (−11.9 to 5.4) | 1.3 (−11.7 to 16.2) | −0.8 (−10.1 to 9.5) |
| NOX | −1.0 (−4.9 to 3.1) | −0.7 (−3.5 to 2.3) | −0.9 (−5.0 to 3.5) | −0.5 (−3.6 to 2.7) |
*The conditional logistic regression model fits the pollutants at lag 0 and adjusts for two natural cubic splines (df=2) for temperature (lags 0–1 and 2–6), two natural cubic splines (df=2) for humidity (lags 0–1 and 2–6), public holidays and a sine/cosine annual cycle.
LACI, lacunar infarct; NO2, nitrogen dioxide; NOX, NO2+nitrogen oxide; O3, ozone; PACI, partial anterior circulation infarct; PM10, particulate matter <10 µm in diameter; PM2.5, particulate matter <2.5 µm in diameter; POCI, posterior circulation infarct; TACI, anterior circulation infarct.