1976–8 (n=1034) | 1991–4 (n=1104) | |
FEV_{1} (% predicted) | ||
Smoking | –2.3 (–4.3 to –0.3) | –2.7 (–4.2 to –1.2) |
Asthma | –2.4 (–10.4 to 5.6) | –10.0 (–13.5 to –6.4) |
FEV_{1}/FVC (% predicted) | ||
Smoking | –1.1 (–2.5 to 0.2) | –1.9 (–2.8 to –1.0) |
Asthma | –1.8 (–7.2 to 3.5) | –7.8 (–9.9 to –5.6) |
Figures in the table are regression coefficients in units of the dependent variable for smokers relative to non-smokers and asthmatics relative to non-asthmatics, respectively. In brackets are shown the 95 % confidence intervals of the regression coefficients.