Table 4.
Variation in RR of Glioma/PNET Across Different Levels of Radiation Exposure Resulting From Radiotherapy
| Level of Exposure, Gy | Cases |
Controls |
Unadjusted Analysis |
||||
|---|---|---|---|---|---|---|---|
| No. | Mean Dose (Gy) | No. | Mean Dose (Gy) | RR | 95% CI | P | |
| Incomplete information | 13 | 13 | |||||
| 0 | 13 | 17 | 1 | ||||
| 0.01-9.99 | 11 | 0.78 | 27 | 0.79 | 0.5 | 0.2 to 1.5 | .230 |
| 10.00-19.99 | 4 | 18.45 | 9 | 17.48 | 0.5 | 0.1 to 2.3 | .406 |
| 20.00-29.99 | 18 | 23.57 | 8 | 23.84 | 2.6 | 0.9 to 8.0 | .084 |
| 30.00-39.99 | 6 | 35.17 | 3 | 34.00 | 3.4 | 0.5 to 23.0 | .215 |
| ≥ 40.00 | 16 | 45.04 | 4 | 46.43 | 4.4 | 1.2 to 16.4 | .028 |
| Total* | 81 | 81 | |||||
Abbreviations: RR, relative risk; PNET, primitive neuroectodermal tumor.
*
Likelihood ratio test for evidence of heterogeneity in RRs across different levels of exposure to radiation: P for unadjusted analysis = .0013.