Figure 2From: Smoking, season, and detection of chlamydia pneumoniaeDNA in clinically stable COPD patientsRelation of Chlamydia pneumoniae DNA prevalence in blood or sputum versus plasma nicotine metabolite levels among 73 patients with stable chronic obstructive pulmonary disease. Nicotine metabolites of < 25 μg/L indicate no recent exposure to smoking. For nicotine metabolites = 25 μg/L, odds ratio = 2.1 (95% CI: 0.8, 5.7, P = 0.13) for detection of C. pneumoniae DNA (SPSS).Back to article page