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Table 6 Final model including car/truck exhaust and scented laundry

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
  1. aBased on 7-day averages using data from USEPA collected in Springfield, Ware and Worcester
  2. bBased on 7-day averages using data from NOAA collected at Worcester Regional Airport
  3. cBased on self-reports of exposures in previous week; collected from questionnaires