Population attributable risks for manual workers in industry and service by 1986 socio-economic class
| Attacks of SOB | Wheezing | Asthmatic symptom complex | Asthma | Asthma medicines | Chronic productive cough | |
| Industry | 8.9 (3.6–13) | 9.0 (2.0–13) | 11 (3.9–16) | 8.8 (0–14) | 6.5 (-0.20–11)# | 10 (2.2–16) |
| Service | 7.6 (0–13) | 12 (6.3–17) | 11 (2.4–17) | 6.1 (-5.1–13) | 8.3 (0–15) | 8.7 (0–15) |
Data are presented as % (95% confidence interval). SOB: shortness of breath. #: p = 0.055 for corresponding odds ratio.