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Table 3 Distribution of selected environmental risk factors, the corresponding ors and 95% CIs among non-smokers

From: Combined effects of lung disease history, environmental exposures, and family history of lung cancer to susceptibility of lung cancer in Chinese non-smokers

Environmental risk factors

Controls

Cases

β

aOR (95%CI)*

(n = 767) (%)

(n = 767) (%)

Polluting companies near home

 No

711 (92.7%)

627 (81.7%)

–

1.000

 Yes

56 (7.3%)

140 (18.3%)

0.919

2.507 (1.707, 3.681)

Food temperature when eating (tea, soop, porridge, etc.)

    

 Not cold and not hot

667 (87.0%)

627 (81.7%)

–

1.000

 Cold

16 (2.0%)

48 (6.3%)

1.411

4.102 (2.035, 8.270)

 Hot

84 (11.0%)

92 (12.0%)

0.086

1.090 (0.744, 1.595)

Intake of green vegetables

    

 < 1/day

36 (4.7%)

75 (9.8%)

0.498

1.646 (1.016, 2.667)

 ≥ 1/day

731 (95.3%)

692 (90.2%)

–

1.000

Intake of fruit

    

 < 1/day

306 (39.9%)

526 (68.6%)

0.862

2.367 (1.834, 3.055)

 ≥ 1/day

461 (60.1%)

241 (31.4%)

–

1.000

Intake of seafood

    

 < 5/wk

725 (94.5%)

692 (90.2%)

–

1.000

 ≥ 5/wk

42 (5.5%)

75 (9.8%)

0.859

2.361 (1.452, 3.841)

Intake of fried food

    

 < 3/wk

749 (97.7%)

722 (94.1%)

–

1.000

 ≥ 3/wk

18 (2.3%)

45 (5.9%)

0.882

2.415 (1.203, 4.849)

Intake of smoked food

    

 < 3/wk

764 (99.6%)

747 (97.4%)

–

1.000

 ≥ 3/wk

3 (0.4%)

20 (2.6%)

1.665

5.286 (1.292, 21.630)

Take vitamins regularly

    

 No

594 (77.4%)

681 (88.8%)

0.398

1.489 (1.063, 2.087)

 Yes

173 (22.6%)

86 (11.2%)

–

1.000

Drinking tea (years)

    

 Don't drink tea

487 (63.5%)

604 (78.7%)

0.764

2.148 (1.510, 3.055)

 < 20

128 (16.7%)

68 (8.9%)

0.128

1.137 (0.707, 1.829)

 ≥ 20

152 (19.8%)

95 (12.4%)

–

1.000

Lifetime exposure to family’s environmental tobacco smoke (ETS) (smoker-years)a

    

 No exposure

527 (68.7%)

387 (50.5%)

–

1.000

 0–28.210

135 (17.6%)

175 (22.8%)

0.632

1.882 (1.372, 2.582)

 ≥ 28.210

105 (13.7%)

205 (26.7%)

0.912

2.490 (1.800, 3.444)

Lifetime exposure to workplace’s environmental tobacco smoke (ETS) (years)b

    

 No exposure

636 (82.9%)

606 (79.0%)

–

1.000

 0–25

66 (8.6%)

74 (9.6%)

0.223

1.250 (0.806, 1.940)

 ≥ 25

65 (8.5%)

87 (11.3%)

0.624

1.867 (1.228, 2.837)

Exercise

    

 No

405 (52.8%)

510 (66.5%)

0.417

1.517 (1.186, 1.940)

 ≥ 1/wk

362 (47.2%)

257 (33.5%)

–

1.000

  1. The bold values represent P values less than 0.05
  2. aOR adjusted odds ratio, CI confidence interval
  3. *Adjusted for sex, age, marriage, education, occupation
  4. aThe indicated subgroups were categorized by the median of smoker-years in the cases and controls who were exposed to environmental tobacco smoke in family. Smoker-years at household were the product of the number of smokers smoking inside the house and the years of exposure to such behavior
  5. bThe indicated subgroups were categorized by the median of years in the cases and controls who were exposed to environmental tobacco smoke in workplace
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Respiratory Research

ISSN: 1465-993X

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