Fig. 6
From: The effect of ambient PM2.5 exposure on survival of lung cancer patients after lobectomy
HRs of postoperative death in lung cancer patients in association with specific monthly (1–6 months after operation) exposure to PM2.5 adjusted for specific monthly O3 exposure. The model was adjusted for age at operation, sex, occupation type, ethnicity, marital status, length of hospitalization, smoking, and alcohol consumption. HRs: hazard ratios; PM2.5: fine particulate matter; O3: ozone