Adjusted odds ratios for intracranial tumours, leukemia and lymphomas related to the number of computed tomography scans
| Number of CT scans | Intracranial tumours | Leukemia | Non-Hodgkin lymphoma | Hodgkin lymphoma | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| No. of patients* | No. of controls* | Adjusted OR† (95% CI) | No. of patients* | No. of controls* | Adjusted OR† (95% CI) | No. of patients* | No. of controls* | Adjusted OR† (95% CI) | No. of patients* | No. of controls* | Adjusted OR† (95% CI) | |
| 0 | 2207 | 22 162 | 1 | 3631 | 36 219 | 1 | 1311 | 13 119 | 1 | 557 | 5524 | 1 |
| 1 | 14 | 205 | 0.69 (0.40–1.20) | 21 | 309 | 0.68 (0.43–1.05) | 10 | 116 | 0.87 (0.45–1.68) | 5 | 71 | 0.70 (0.28–1.74) |
| 2–3 | 18 | 77 | 2.36 (1.40–3.97) | 9 | 126 | 0.71 (0.36–1.40) | 6 | 59 | 1.02 (0.44–2.38) | < 3 | 42 | 0.23 (0.03–1.68) |
| ≥ 4 | 6 | 6 | 9.01 (2.89–28.11) | 6 | 13 | 4.80 (1.79–12.84) | 4 | 6 | 6.76 (1.91–23.96) | < 3 | 3 | 3.61 (0.37–35.08) |
Note: CI = confidence interval, CT = computed tomography, OR = adjusted odds ratio.
↵* National Health Insurance Research Database policy on protecting confidentiality requires suppression of cells < 3.
↵† Adjusted by the year of cohort entry, annual family income (both as linear variables) and urbanization level (as a categorical variable).