| Radon exposure Bq·m−3 | ||||
| ≤100 | 101–147 | 148–199 | ≥200 | |
| Patients | ||||
| Cases | 36 (20.3) | 24 (13.5) | 32 (32.8) | 85 (48) |
| Controls | 73 (26.8) | 61 (22.4) | 58 (21.3) | 80 (29.4) |
| OR (95% CI)# | 1§ | 0.84 (0.45–1.56) | 1.14 (0.63–2.06) | 2.33 (1.40–3.89) |
| OR (95% CI)¶ | 1§ | 0.80 (0.43–1.50) | 1.16 (0.64–2.11) | 2.42 (1.45–4.06) |
| Females | ||||
| Cases | 29 (20.7%) | 20 (14.3%) | 24 (17.1) | 67 (47.8) |
| Controls | 60 (28.3%) | 46 (21.7%) | 51 (24.01) | 55 (25.9) |
| OR (95% CI)+ | 1§ | 0.87 (0.43–1.75) | 1.00 (0.52–1.95) | 2.84 (1.58–5.09) |
| Patients at same dwelling ≥20 years | ||||
| Cases | 30 (24.6) | 15 (12.3) | 22 (18.0) | 55 (45.1) |
| Controls | 57 (28.8) | 37 (18.7) | 37 (18.7) | 67 (33.8) |
| OR (95% CI)¶ | 1§ | 0.76 (0.36–1.61) | 1.18 (0.59–2.36) | 1.83 (1.01–3.30) |
Data are presented as n (%) unless otherwise stated. #: adjusted for sex and age; ¶: adjusted for sex, age and environmental tobacco-smoke exposure at home; +: adjusted for age and environmental tobacco-smoke exposure at home; §: no confidence interval as reference category.