Table 3 OR for lung cancer according to the number of first-degree relatives (parents, siblings) affected by lung cancer

From: Familial aggregation of lung cancer in a high incidence area in China

No. of relative affected

Probands

Controls

OR a

95% CI

OR b

95% CI

No.

%

No.

%

0

589

79.5

646

87.3

1.00

 

1.00

 

1

109

14.8

81

10.9

1.48*

1.07–2.03

1.41*

1.03–1.99

2

29

3.9

11

1.5

2.89**

1.37–6.21

2.69**

1.32–6.03

3

10

1.4

2

0.3

5.48*

1.13–36.4

5.40*

1.11–35.9

4

3

0.4

0

0.0

’

’

’

’

 

740

100.0

740

100.0

    

P-value

0.001

       
  1. OR=odds ratio; CI=confidence interval.
  2. *P<0.05.
  3. **P<0.01.
  4. aOR, not adjusted.
  5. bOR, adjusted for age, sex, size of the family, commune of residence, COPD, smoking and cumulation index of smoky coal exposure.
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