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

Table 4 Comparison of estimated effects of pollution vs. clean air days between COPD and Control subjects

Variable	Estimate COPD vs Control	95 % CI	P value
EBC nitrite + nitrate (NOx)	6.34	(1.53, 26.17)	0.01
EBC 8-isoprostane	0.19	(0.01, 4.44)	0.29
FEV1 (L)	0.00	(-0.15, 0.16)	0.96
FVC (L)	−0.16	(-0.40, 0.08)	0.19
Aggregate symptom score	1.41	(-2.36, 5.18)	0.45

Displayed are the ratios of the geometric means (for 8-isoprostane and NOx) and the difference in the estimated pollution effects (for FEV1, FVC, and symptom score) which compare the estimated pollution effects between the COPD patients and Controls

ISSN: 2054-9040