Fig. 2
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 surgery) exposure to PM2.5. Model 1 was adjusted for age at operation, sex, occupation type, ethnicity, marital status, and length of hospitalization. Model 2 was adjusted for the factors in Model 1, as well as operation season. Model 3 was adjusted for the factors in Model 2, as well as for smoking and alcohol consumption. HRs: hazard ratios; PM2.5: fine particulate matter