Table 2. Case–control analysis: association between exposure to diagnostic x-rays and prostate cancer.
| Exposure variable | Number exposed (total) | Crude OR (95% CI) | Adjusted ORa (95% CI) |
|---|---|---|---|
| Barium meal | |||
| >5 years | 159 (678) | 1.28 (0.90–1.82) | 1.21 (0.84–1.73) |
| >10 years | 138 (657) | 1.25 (0.86–1.83) | 1.18 (0.80–1.72) |
| >20 years | 90 (609) | 1.04 (0.66–1.62) | 0.96 (0.61–1.52) |
| Barium enema | |||
| >5 years | 36 (666) | 2.15 (1.05–4.36)† | 2.06 (1.01–4.20)† |
| >10 years | 27 (657) | 2.55 (1.10–5.90)† | 2.49 (1.07–5.78)† |
| >20 years | 10 (640) | 1.61 (0.45–5.76) | 1.49 (0.41–5.37) |
| IVP (kidneys) | |||
| >5 years | 49 (687) | 1.63 (0.90–2.96) | 1.67 (0.92–3.03) |
| >10 years | 37 (675) | 1.51 (0.77–2.97) | 1.55 (0.79–3.06) |
| >20 years | 19 (657) | 1.77 (0.69–4.55) | 1.69 (0.66–4.36) |
| Hip/pelvic x-ray | |||
| >5 years | 97 (583) | 2.20 (1.41–3.45)† | 2.23 (1.42–3.49)‡ |
| >10 years | 78 (564) | 2.57 (1.56–4.23)‡ | 2.65 (1.60–4.39)‡ |
| >20 years | 42 (528) | 2.72 (1.40–5.30)† | 2.87 (1.47–5.62)† |
| Upper leg x-ray | |||
| >5 years | 60 (643) | 1.12 (0.66–1.90) | 1.11 (0.65–1.89) |
| >10 years | 48 (631) | 1.46 (0.81–2.66) | 1.45 (0.80–2.64) |
| >20 years | 39 (622) | 1.35 (0.70–2.60) | 1.37 (0.71–2.65) |
OR=Odds Ratio; CI=Confidence interval.
†P-value significant; ‡P-value<0.001.
a
Adjusted for age at diagnosis and social class.