Table 2 Multivariable logistic regression analysis for lung cancer by smoking status^a

Education

Primary school or below

Middle school

0.50 (0.33–0.76)

College or above

0.37 (0.23–0.59)

0.49 (0.35–0.70)

Marital status

Married

Others

0.57 (0.36–0.90)

History of lung diseases

2.82 (1.53–5.12)

2.28 (1.53–3.45)

Cancer history in first-degree relatives

2.44 (1.50–3.94)

1.56 (0.99–2.48)

2.25 (1.32–4.09)

Smoking status

Pack-years

 < 20

N.A

20–40

1.90 (1.24–2.91)

2.40 (1.36–4.22)

 ≥ 40

2.41 (1.55–3.74)

3.09 (1.80–5.26)

Years of smoking cessation

2–5 years

N.A

N.A

5–10 years

0.60 (0.35–1.02)

10–20 years

0.65 (0.40–1.03)

 ≥ 20 years

0.51 (0.31–0.83)

Exposure of indoor air pollutants

Residential radon exposure (in quartiles)^c

First

Second

2.42 (1.25–4.85)

Third

2.31 (1.21–4.57)

Fourth

2.91 (1.55–5.68)

Occupational exposure

Carcinogen exposure

1.84 (1.22–2.77)

1.33 (0.93–1.89)

Mask used in workplace

0.50 (0.28–0.88)

Dust control in workplace

0.31 (0.16–0.67)

0.22 (0.12–0.40)

0.20 (0.08–0.41)

Dietary habits and drinking habits

Fruit/green vegetable

(≥ 1 time /day)

1.44 (0.95–2.19)

Meat

(≥ 1 time /day)

0.47 (0.26–0.80)

0.61 (0.40–0.91)

0.46 (0.26–0.83)