First author [ref no.] | Country of study | Risk factor | Disease/condition | OR (95% CI) |
Simoni 23 | Italy | PM2.5 (over median value versus under median value) | Chronic bronchitic and/or asthmatic symptoms | 1.83 (1.26–2.65) |
| | | Irritative symptoms | 1.68 (1.22–2.31) |
| | | Lung function (PEF variation) | |
| | | Max amplitude: | 1.23 (1.03–1.48) |
| | | Diurnal variation: | 1.26 (1.05–1.51) |
Xu 14 | China | Use of coal stove | Respiratory symptoms | |
| | Either cooking or heating versus no | | 1.5 (1.0–2.3) |
| | Both cooking and heating versus no/never smokers | | 2.1 (1.5–3.1) |
Venners 24# | China | Median indoor PM10 µg·m−3 | Chronic phlegm (males) | |
| | | Rural Anging versus ref | 4.96 (2.13–11.54) |
| | | Beijing versus ref | 8.78 (4.49–17.18) |
| | | Wheeze (males) | |
| | | Rural Anging versus ref | 3.99 (1.77–8.91) |
| | | Beijing versus ref | 5.26 (2.71–10.21) |
| | | Chronic phlegm (females) | |
| | | Rural Anging versus ref | 1.52 (0.52–4.45) |
| | | Beijing versus ref | 8.93 (3.56–22.43) |
| | | Wheeze (females) | |
| | | Rural Anging versus ref | 2.91 (1.18–7.18) |
| | | Beijing versus ref | 8.28 (3.66–18.74) |