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Table 1 Demographic characteristics of lung cancer patients and controls in a population based case-control study, Greater Toronto Area, Ontario, 1997- 2002

From: Lung cancer risk in never-smokers: a population-based case-control study of epidemiologic risk factors

 

Case, n(%)

Control, n(%)

 
 

Smokers

Never smokers

Total

Smokers

Never smokers

Total

p valuea

Total

289

156

445

482

466

948

 

Gender

       

   Male

163 (56)

46 (30)

209 (47)

241 (50)

145 (31)

386 (41)

p = 0.03

   Female

126 (44)

110 (70)

236 (53)

241 (50)

321 (69)

562 (59)

 

Age

       

   < 35

1 (< 1)

10 (6)

11 (3)

58 (12)

86 (18)

144 (15)

 

   35-45

9 (3)

21 (13)

30 (7)

77 (16)

89 (19)

166 (180

 

   45-55

34 (12)

27 (17)

61 (14)

88 (18)

85 (18)

173 (18)

 

   55-65

63 (22)

28 (18)

91 (20)

101 (21)

88 (19)

189 (20)

 

   65-75

131 (45)

57 (37)

188 (42)

100 (21)

71 (15)

170 (18)

 

   > 75

51 (18)

13 (8)

64 (14)

58 (12)

48 (10)

106 (11)

 

Age, Mean ± SD

66 ± 10

59 ± 13

64 ± 12

56 ± 16

53 ± 17

54 ± 16

< .0001

Ethnicity

       

   White

255 (88)

97 (62)

352 (79)

429 (89)

346 (74)

775 (82)

p = 0.07

   Asian

21 (7)

48 (31)

69 (16)

27 (6)

78 (17)

105 (11)

 

   Other

13 (5)

11 (7)

24 (5)

26 (5)

42 (9)

68 (7)

 

Education

       

   < 8 years

97 (34)

36 (23)

137 (31)

55 (11)

68 (15)

140 (15)

< .0001

   8-11 years

137 (47)

52 (33)

189 (42)

212 (44)

187 (40)

399 (42)

 

   ≥12 years

55 (19)

64 (41)

119 (27)

205 (43)

204 (44)

409 (43)

 

All types of smoking combined

       

   Never

 

156

156 (35)

 

466

466 (49)

< .0001

   Former (> 2 yrs. Since quitting)

159 (55)

 

159 (36)

319 (66)

 

319 (34)

 

   Current

130 (45)

 

130 (29)

163 (34)

 

163 (17)

 

   Pack-yearsb, Mean ± SD

45 ± 35

  

25 ± 27

  

< .0001

Histology

       

   Adenocarcinoma

80 (28)

76 (49)

156 (35)

    

   Squamous cell carcinoma

68 (24)

9 (6)

77 (17)

    

   Small-cell carcinoma

28 (10)

4 (3)

32 (7)

    

   Large cell carcinoma

21 (7)

6 (4)

27 (6)

    

   Others/Mixed

46 (16)

26 (17)

72 (16)

    

Not classified/clinical

diagnosis

46 (16)

35 (22)

81 (18)

    
  1. a p-values from χ2 test or t-test across cases and controls
  2. b Pack-years among ever and current smokers