Multivariate associations (adjusted odds ratios and 95% confidence intervals) between asthma/chronic bronchitis symptoms, and risk factors
| Controls (n = 152*) | All cases (n = 40) | OR (95% CI) | Asthma (n = 24) | OR (95% CI) | Chronic bronchitis without asthma (n = 16) | OR (95% CI) | |
|---|---|---|---|---|---|---|---|
| Multiple logistic regression analyses adjusted for all listed variables and age tertile. | |||||||
| *Three controls had missing values for one or more of the exposure variables and were not included in this multivariate model. | |||||||
| Bleach (both undiluted and diluted) | |||||||
| <364 times/year | 56 | 8 | 1.0 | 3 | 1.0 | 5 | 1.0 |
| 364–640 times/year | 53 | 11 | 3.3 (0.9 to 11) | 9 | 10 (1.7 to 60) | 2 | 0.9 (0.1 to 6.5) |
| ⩾640 times/year | 43 | 21 | 4.9 (1.5 to 15) | 12 | 12 (2.3 to 67) | 9 | 2.6 (0.6 to 12) |
| Use of liquid multi-use cleaning products | |||||||
| <266 times/year | 50 | 20 | 1.0 | 13 | 1.0 | 7 | 1.0 |
| 266–480 times/year | 51 | 12 | 0.3 (0.1 to 0.8) | 6 | 0.2 (0.0 to 0.7) | 6 | 0.3 (0.1 to 1.6) |
| ⩾480 times/year | 51 | 8 | 0.2 (0.1 to 0.6) | 5 | 0.1 (0.0 to 0.5) | 3 | 0.2 (0.0 to 1.3) |
| Washing dishes | |||||||
| <376 times/year | 64 | 10 | 1.0 | 8 | 1.0 | 2 | 1.0 |
| 376–520 times/year | 37 | 12 | 3.2 (1.0 to 10) | 6 | 2.0 (0.5 to 8.9) | 6 | 7.5 (1.0 to 53) |
| ⩾520 times/year | 51 | 18 | 3.1 (1.1 to 8.9) | 10 | 3.8 (1.0 to 14) | 8 | 6.5 (0.9 to 47) |
| Inhalation of an important quantity of vapours, gas, or fumes related to cleaning agents | |||||||
| Never | 73 | 9 | 1.0 | 5 | 1.0 | 4 | 1.0 |
| Ever | 79 | 31 | 2.3 (0.9 to 6.1) | 19 | 3.8 (1.0 to 14) | 12 | 0.9 (0.2 to 4.3) |
| Employment in non-domestic cleaning | |||||||
| Never | 101 | 9 | 1.0 | 5 | 1.0 | 4 | 1.0 |
| Ever | 51 | 31 | 8.5 (3.2 to 23) | 19 | 12 (3.2 to 46) | 12 | 7.9 (1.6 to 39) |
| Smoking | |||||||
| Never | 127 | 25 | 1.0 | 19 | 1.0 | 6 | 1.0 |
| Currently | 15 | 11 | 4.1 (1.1 to 15) | 2 | 0.5 (0.1 to 3.9) | 9 | 22 (3.6 to 137) |
| Formerly | 10 | 4 | 5.3 (1.1 to 25) | 3 | 5.5 (0.9 to 33) | 1 | 8.9 (0.5 to 173) |