Gender | Male | 36 | (44.4) | 128 | (37.0) |
Female | 45 | (55.6) | 218 | (63.0) |
Smoking | Current or former smoker | 22 | (27.2) | 84 | (24.3) |
Never smoker | 59 | (72.8) | 262 | (75.7) |
Atopy | Positive to 1 or 2 allergens | 38 | (48.1) | 155 | (47.6) |
Positive to 3 or more allergens | 17 | (21.5) | 97 | (29.8) |
Negative | 24 | (30.4) | 74 | (22.7) |
Rhinitis | Yes | 28 | (35.4) | 135 | (39.0) |
No | 51 | (64.6) | 211 | (61.0) |
Education | 1–8 years | 25 | (30.9) | 50 | (14.5) |
9–11 years | 47 | (58.0) | 189 | (54.6) |
⩾12 years | 9 | (11.1) | 107 | (30.9) |
Self-reported exposure | Dust, vapour, humidity, or gases | 32 | (40.5) | 133 | (38.7) |
Chemical products or paints | 9 | (11.4) | 18 | (5.2) |
More than one agent | 24 | (30.4) | 34 | (9.9) |
No reported exposure | 14 | (17.7) | 159 | (46.2) |