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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