Prevalence of COPD and asthma in subgroups of patients with persistent cough according to sex, age, and smoking history.
| Characteristics | COPD, n (%, 95% CI) | Asthma, n (%, 95% CI) | No COPD or asthma, n (%, 95% CI) |
|---|---|---|---|
| Sex | |||
| Males (n = 158) | 62 (39, 32 to 46) | 10 (6, 3 to 11) | 86 (54, 47 to 62) |
| Females (n = 195) | 40 (21, 15 to 27) | 13 (7, 4 to 11) | 142 (73, 66 to 79) |
| Age in years | |||
| 50–59 (n = 142) | 30 (21, 15 to 29) | 10 (7, 4 to 12) | 102 (72, 64 to 79) |
| 60–69 (n = 125) | 37 (30, 22 to 38) | 10 (8, 4 to 14) | 78 (62, 54 to 70) |
| ≥70 (n = 86) | 35 (41, 31 to 51) | 3 (3, 1 to 10) | 48 (56, 45 to 66) |
| Smoking | |||
| Never smoker (n = 92) | 3 (3, 1 to 9) | 8 (9, 4 to 16) | 81 (88, 82 to 95) |
| 1–9 pack-yearsa (n = 97) | 17 (18, 11 to 26) | 10 (10, 6 to 18) | 70 (72, 63 to 80) |
| 10–29 pack-years (n = 93) | 44 (47, 37 to 57) | 3 (3, 1 to 9) | 46 (49, 40 to 59) |
| ≥30 pack-years (n = 71) | 38 (54, 42 to 65) | 2 (3, 1 to 10) | 31 (44, 33 to 55) |
↵a Pack-years = (number of cigarettes smoked per day/20) × number of years smoking.