Results of multivariate model of factors associated with risk of COPD exacerbation
| Variable | OR | 95% CI | |
| Car/truck exhaust | 4.36 | 1.76 | 10.8 |
| Scented laundry | 2.69 | 1.31 | 5.52 |
| Temperature | |||
| warm versus cold | 0.43 | 0.26 | 0.70 |
| moderate versus cold | 1.95 | 1.09 | 3.49 |
| Self-reported respiratory infection | 7.90 | 4.29 | 14.5 |
| Exercise | 0.59 | 0.35 | 1.00 |
AIC=351.
*2log likelihood=339.
COPD, chronic obstructive pulmonary disease.