Table 1 Baseline characteristics at 1 January 1973 and crude mortality rate (MR) per 100 000 person‐years from obstructive lung disease (OLD) and pneumonia of respondents during follow up for 30 years by sex, respiratory symptoms, occupational exposure, and smoking habits.
Characteristic | Total at baseline (n = 17678) | Deaths from OLD (n = 250) | Deaths from pneumonia (n = 293) | |||
---|---|---|---|---|---|---|
N | % | n | MR | n | MR | |
Sex | ||||||
Men | 8147 | 46 | 146 | 74 | 107 | 55 |
Women | 9531 | 54 | 104 | 35 | 186 | 66 |
Respiratory symptoms* | ||||||
None | 8696 | 49 | 36 | 16 | 143 | 64 |
Symptom score | ||||||
1–3 | 6272 | 36 | 86 | 55 | 95 | 60 |
4–6 | 1966 | 11 | 62 | 137 | 30 | 66 |
⩾7 | 712 | 4 | 66 | 511 | 23 | 178 |
Groups | ||||||
Cough symptoms | 5732 | 32 | 175 | 129 | 106 | 78 |
Asthma‐like symptoms | 6092 | 34 | 182 | 107 | 90 | 61 |
Moderate dyspnoea on exercise | 2298 | 13 | 53 | 101 | 28 | 37 |
Severe dyspnoea on exercise | 851 | 5 | 59 | 383 | 24 | 156 |
Occupational exposure† | ||||||
Yes | 3138 | 18 | 82 | 88 | 47 | 47 |
No | 13513 | 76 | 143 | 35 | 210 | 53 |
Smoking habit | ||||||
Never | 6567 | 37 | 24 | 14 | 117 | 69 |
Former | 2011 | 11 | 25 | 51 | 44 | 90 |
Current (g tobacco/day) | ||||||
<10 | 2521 | 14 | 31 | 48 | 35 | 55 |
10–19 | 4399 | 25 | 107 | 99 | 59 | 55 |
⩾20 | 1800 | 10 | 56 | 135 | 25 | 60 |
Unknown | 262 | 2 | 3 | 48 | 8 | 129 |
*32 persons did not answer any questions about respiratory symptoms.
†1027 persons did not answer this question.