Crude percentage prevalence of individual symptoms, receipt of asthma medication, or obstructive airways disease in adults who responded to the specific question in each survey.a
| 1993 | 1995 | 1999 | 2001 | |||||
|---|---|---|---|---|---|---|---|---|
| n | Prevalence (95% CI) | n | Prevalence (95% CI) | n | Prevalence (95% CI) | n | Prevalence (95% CI) | |
| Wheezeb | 7653 | 30 (29 to 31) | 6924 | 30 (29 to 31) | 6455 | 35(33 to 36) | 6344 | 34 (33 to 35) |
| Woken by chest tightnessb | 7630 | 21 (21 to 22) | 6939 | 21 (20 to 22) | 6496 | 22 (21 to 23) | 6374 | 20 (20 to 22) |
| Woken by coughb | 7653 | 31 (30 to 32) | 6916 | 33 (31 to 34) | 6499 | 35 (34 to 36) | 6393 | 36 (35 to 37) |
| Woken by shortness of breathb | 7614 | 14 (13 to 15) | 6940 | 14 (13 to 14) | 6492 | 15 (14 to 16) | 6368 | 14 (13 to 15) |
| Asthma attackb | 7648 | 8 (7 to 9) | 6928 | 8 (7 to 9) | 6486 | 9 (8 to 9) | 6359 | 8 (7 to 9) |
| Current asthma medication | 7700 | 12 (11 to 13) | 6990 | 12 (11 to 13) | 6526 | 14 (13 to 15) | 6421 | 14 (13 to 15) |
| Obstructive airway disease | 7681 | 15 (14 to 16) | 6977 | 15 (14 to 16) | 6543 | 16 (16 to 17) | 6422 | 16 (16 to 17) |