Table 3.
Associations of residential radon and tobacco smoke exposure with lung cancer.
| Variables | Case, n | Control, n | Conditional Logistic Regression | Conventional Logistic Regression | ||
|---|---|---|---|---|---|---|
| OR (95% CI) * | p-Value | OR (95% CI) † | p-Value | |||
| Residential radon | ||||||
| Low (<100 Bq/m3) | 448 | 427 | 1.00 (reference) | 1.00 (reference) | ||
| High (≥100 Bq/m3) | 71 | 92 | 1.56 (1.03–2.37) | 0.037 | 1.52 (1.00–2.31) | 0.048 |
| Smoke exposure | ||||||
| Smoke-free | 122 | 254 | 1.00 (reference) | 1.00 (reference) | ||
| Smoke-exposed | 397 | 265 | 2.67 (1.69–4.21) | <0.001 | 2.64 (1.68–4.17) | <0.001 |
| Radon and smoke exposure | ||||||
| Low-radon smoke-free | 109 | 204 | 1.00 (reference) | 1.00 (reference) | ||
| High-radon smoke-free | 13 | 50 | 1.01 (0.49–2.07) | 0.956 | 1.04 (0.51–2.13) | 0.919 |
| Low-radon smoke-exposed | 339 | 223 | 2.39 (1.48–3.87) | <0.001 | 2.41 (1.49–3.89) | <0.001 |
| High-radon smoke-exposed | 58 | 42 | 4.93 (2.57–9.45) | <0.001 | 4.65 (2.44–8.88) | <0.001 |
* Adjusted for second-hand smoking, sleeping hours, indoor hours, housing type, floor, presence of house cracks, and green ratio. CI, confidence interval; OR, odds ratio. † Conventional logistic regression was further adjusted for age and sex.