Table 1 Baseline characteristics of the asthma study cohort
Overall (N=939) | No night symptom (N=385) | Night symptom (N=554) | |
|---|---|---|---|
Age | 46.6 (23.0) | 48.6 (23.1) | 45.3 (22.8) |
Duration of asthma | 17.5 (16.8) | 17.9 (16.7) | 17.2 (16.9) |
Weight | 60.4 (20.8) | 61.3 (19.8) | 59.8 (21.4) |
Height | 152.0 (23.1) | 152.6 (21.3) | 151.7 (24.3) |
Gender (Male) | 418 (44.5) | 166 (43.1) | 252 (45.5) |
Race | |||
Chinese | 564 (60.1) | 246 (63.9) | 318 (57.4) |
Malay | 132 (14.1) | 68 (17.7) | 122 (22.0) |
Indian | 190 (20.2) | 56 (14.6) | 76 (13.7) |
Others | 53 (5.6) | 15 (3.9) | 38 (6.9) |
Rhinitis (Yes) | 288 (30.7) | 116 (30.1) | 172 (31.1) |
Conjunctivitis (Yes) | 29 (3.1) | 14 (3.6) | 15 (2.7) |
Eczema (Yes) | 79 (8.4) | 28 (7.3) | 51 (59.0) |
Cigarette smoking | |||
Current | 64 (6.8) | 20 (5.2) | 44 (7.9) |
Ex-Smoker | 104 (11.1) | 40 (10.4) | 64 (11.6) |
Never | 771 (82.1) | 325 (84.4) | 446 (80.5) |
Smoke as a trigger factor | |||
Yes | 373 (39.8) | 157 (40.8) | 216 (39.1) |
No | 549 (58.6) | 222 (57.7) | 327 (59.2) |
Unknown | 15 (1.6) | 6 (1.6) | 9 (1.6) |
Day off work | |||
⩽2/month | 94 (11.2) | 21 (6.0) | 73 (14.9) |
⩽2/week | 4 (0.5) | 0 (0.0) | 4 (0.8) |
⩾3/week | 7 (0.8) | 2 (0.6) | 5 (1.0) |
None | 735 (87.5) | 327 (93.4) | 408 (83.3) |
Day off SOB | |||
⩽2/month | 201 (21.5) | 48 (12.6) | 153 (27.6) |
⩽2/week | 177 (18.9) | 44 (11.5) | 133 (24.0) |
⩾3/week | 252 (26.9) | 38 (10.0) | 214 (38.6) |
None | 306 (32.7) | 252 (66.0) | 54 (9.8) |
Usual activities (number of days off work or school) | |||
⩽2/month | 47 (5.3) | 7 (1.9) | 40 (7.7) |
⩽2/week | 8 (0.9) | 1 (0.3) | 7 (1.3) |
⩾3/week | 7 (0.8) | 1 (0.3) | 6 (1.2) |
None | 829 (93.0) | 360 (97.6) | 469 (89.9) |
Asthma severity classification a | |||
Intermittent | 248 (26.5) | 239 (62.4) | 9 (1.6) |
Mild persistent | 237 (25.3) | 75 (19.6) | 162 (29.3) |
Moderate persistent | 302 (32.2) | 65 (17.0) | 237 (42.9) |
Severe persistent | 149 (15.9) | 4 (1.0) | 145 (26.2) |
