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Table 3 Comparison of variables on pollution vs. clean air quality days

From: Respiratory effects of particulate air pollution episodes in former smokers with and without chronic obstructive pulmonary disease: a panel study

Variable Group Estimatea 95 % CI P value
Nitrite + nitrate (NOx) COPD 3.15 (1.41, 7.04) 0.007
Control 0.49 (0.14, 1.65) 0.23
8-Isoprostane COPD 0.44 (0.05, 3.61) 0.43
Control 2.34 (0.18, 29.73) 0.49
FEV1 (L) COPD 0.01 (-0.10, 0.12) 0.85
Control 0.01 (-0.10, 0.11) 0.90
FVC (L) COPD −0.17 (-0.37, 0.03) 0.09
Control −0.01 (-0.12, 0.09) 0.80
Aggregate symptom score COPD 3.47 (1.01, 5.93) 0.008
Control 2.02 (-0.92, 4.95) 0.16
  1. a Displayed are estimated ratios of geometric mean levels (with 95 % CIs and p-values) of 8-isoprostane and NOx between pollution and clean air days, as well as estimated mean differences (with 95 % CIs and p-values) in FEV1, FVC, and aggregate symptom score between pollution and clean air days in a) COPD patients and b) Control group participants