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Table 1

Demographic information

Case (988) n (%)Control (1128) n (%)
Age   
 <50 106 (11) 313 (28) 
 50–54 88 (9) 128 (11) 
 55–59 114 (12) 134 (12) 
 60–64 152 (15) 151 (13) 
 65–69 184 (19) 191 (17) 
 ≥70 344 (35) 211 (19) 
Gender   
 Male 538 (54) 525 (47) 
 Female 450 (46) 603 (53) 
Smoking   
 Never-smoker 63 (6) 403 (36) 
 Ex-smoker 519 (53) 506 (45) 
  Years quit < 15 307 (59) 203 (40) 
  Years quit ≥ 15 212 (41) 303 (60) 
 Current smoker 406 (41) 219 (19) 
  Pack-years < 35 78 (19) 118 (54) 
  Pack-years 35–64 148 (37) 65 (30) 
  Pack-years ≥ 60 180 (44) 36 (16) 
Type of Control (11 missing)   
 Spouse  354 (32) 
 Friend  763 (68) 
Histologic cell type (24 missing)   
 Adenocarcinoma 472 (50)  
 Squamous cell carcinoma 225 (24)  
 Large cell carcinoma 77 (8)  
 Small cell carcinoma 88 (9)  
 Other/not specified 84 (9)  
Stage (31 missing)   
 Early stage (I/II) 529 (56)  
 Late stage (III/IV) 410 (44)  
Case (988) n (%)Control (1128) n (%)
Age   
 <50 106 (11) 313 (28) 
 50–54 88 (9) 128 (11) 
 55–59 114 (12) 134 (12) 
 60–64 152 (15) 151 (13) 
 65–69 184 (19) 191 (17) 
 ≥70 344 (35) 211 (19) 
Gender   
 Male 538 (54) 525 (47) 
 Female 450 (46) 603 (53) 
Smoking   
 Never-smoker 63 (6) 403 (36) 
 Ex-smoker 519 (53) 506 (45) 
  Years quit < 15 307 (59) 203 (40) 
  Years quit ≥ 15 212 (41) 303 (60) 
 Current smoker 406 (41) 219 (19) 
  Pack-years < 35 78 (19) 118 (54) 
  Pack-years 35–64 148 (37) 65 (30) 
  Pack-years ≥ 60 180 (44) 36 (16) 
Type of Control (11 missing)   
 Spouse  354 (32) 
 Friend  763 (68) 
Histologic cell type (24 missing)   
 Adenocarcinoma 472 (50)  
 Squamous cell carcinoma 225 (24)  
 Large cell carcinoma 77 (8)  
 Small cell carcinoma 88 (9)  
 Other/not specified 84 (9)  
Stage (31 missing)   
 Early stage (I/II) 529 (56)  
 Late stage (III/IV) 410 (44)  
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