Table 1

Demographic information

Case (988) n (%)Control (1128) n (%)
Age
 <50106 (11)313 (28)
 50–5488 (9)128 (11)
 55–59114 (12)134 (12)
 60–64152 (15)151 (13)
 65–69184 (19)191 (17)
 ≥70344 (35)211 (19)
Gender
 Male538 (54)525 (47)
 Female450 (46)603 (53)
Smoking
 Never-smoker63 (6)403 (36)
 Ex-smoker519 (53)506 (45)
  Years quit < 15307 (59)203 (40)
  Years quit ≥ 15212 (41)303 (60)
 Current smoker406 (41)219 (19)
  Pack-years < 3578 (19)118 (54)
  Pack-years 35–64148 (37)65 (30)
  Pack-years ≥ 60180 (44)36 (16)
Type of Control (11 missing)
 Spouse354 (32)
 Friend763 (68)
Histologic cell type (24 missing)
 Adenocarcinoma472 (50)
 Squamous cell carcinoma225 (24)
 Large cell carcinoma77 (8)
 Small cell carcinoma88 (9)
 Other/not specified84 (9)
Stage (31 missing)
 Early stage (I/II)529 (56)
 Late stage (III/IV)410 (44)