Summary of pooled percentage difference (95% confidence intervals) for effect of parental smoking on lung function
| No. of studies | % difference (95% CI) fixed effect | % difference (95% CI) random effect | |
|---|---|---|---|
| FVC | 19 | –0.2 (–0.4 to +0.1) | –0.4 (–0.8 to +0.0) |
| FEV1 | 21 | –0.9 (–1.2 to –0.7) | –1.4 (–1.9 to –1.0) |
| MEF | 19 | –4.8 (–5.4 to –4.3) | –5.0 (–6.6 to –3.3) |
| EEF | 9 | –4.3 (–5.3 to –3.3) | –4.3 (–5.5 to –3.1) |
FVC = forced vital capacity; FEV1 = forced expiratory volume in one second; MEF = mid expiratory flow rate; EEF = end expiratory flow rate.
Source: reference 8.