From: Low level air pollution and exacerbation of existing copd: a case crossover analysis
Variable | Odds ratio | 95 % confidence interval | |
---|---|---|---|
SO2 a | 2.61 | 1.84 | 3.74 |
PM2.5 a | 0.92 | 0.85 | 0.99 |
Temperatureb | |||
Cool/Cold | 1.0 | 1.0 | 1.0 |
Moderate | 2.31 | 1.26 | 4.25 |
Warm/Hot | 0.78 | 0.46 | 1.31 |
Respiratory Infection/Coldc | 7.53 | 3.95 | 14.4 |
Car/Truck Exhaustc | 2.78 | 1.31 | 5.93 |
Scented Laundryc | 4.88 | 1.84 | 12.9 |