1976–8 (n=1034) | 1991–4 (n=1104) | ||||
---|---|---|---|---|---|
Women (n=533) | Men (n=501) | Women (n=581) | Men (n=523) | ||
Self-reported asthma1-150 | 1.7 (0.6 to 2.8) | 1.2 (0.2 to 2.2) | 4.7 (3.0 to 6.4) | 4.8 (3.0 to 6.7) | |
20–25 years | 3.0 | 0.7 | 5.8 | 4.0 | |
26–30 years | 1.7 | 1.9 | 5.2 | 3.9 | |
31–35 years | 0.5 | 1.1 | 3.9 | 5.7 | |
Occasional phlegm1-151 | 15.4 (12.3 to 18.4) | 16.4 (13.1 to 19.6) | 11.5 (8.9 to 14.1) | 17.9 (14.6 to 21.2) | |
20–25 years | 14.9 | 13.3 | 7.7 | 13.1 | |
26–30 years | 8.4 | 15.2 | 11.5 | 16.7 | |
31–35 years | 22.5 | 19.9 | 12.9 | 20.4 | |
Chronic bronchitis1-151 | 7.1 (4.9 to 9.3) | 9.2 (6.7 to 11.7) | 5.9 (4.0 to 7.9) | 10.9 (8.2 to 13.6) | |
20–25 years | 6.0 | 4.0 | 3.8 | 6.1 | |
26–30 years | 3.4 | 9.7 | 4.7 | 10.3 | |
31–35 years | 11.8 | 12.9 | 7.6 | 13.1 | |
Current smokers1-152 | 60.4 (56.3 to 64.6) | 62.1 (57.8 to 66.3) | 44.0 (39.9 to 48.1) | 46.5 (42.2 to 50.8) | |
20–25 years | 58.3 | 55.3 | 37.5 | 36.0 | |
26–30 years | 58.4 | 64.2 | 47.4 | 49.0 | |
31–35 years | 64.2 | 65.6 | 44.1 | 49.0 |
↵1-150 Asthma is more prevalent in the 1991–4 cohort than in the 1976–8 cohort among women (p=0.009) as well as men (p=0.002). There are no significant sex differences.
↵1-151 Occasional phlegm and chronic bronchitis are more prevalent among men than women in the 1991–4 cohort (p<0.005). There is no sex difference in the 1976–8 cohort nor any difference between cohorts. There is a modest increase with age in occasional phlegm and chronic bronchitis, reaching statistical significance only by pooling women and men (1976–8: p<0.01, 1991–4: p<0.03).
↵1-152 The prevalence of smoking is significantly reduced from 1976–8 to 1991–4 (p<0.001). There is no sex difference in smoking prevalence in either cohort.