Fig. 5
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 relation to specific monthly (1–6 months after operation) exposure to PM2.5 stratified by length of hospitalization (A), sex (B), smoking (C), and age at operation (D). 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 smoking and alcohol consumption. Stratification factors were not adjusted. HRs: hazard ratios; PM2.5: fine particulate matter