Table 2.
Mean percentage of total dose received for percentage volumes of rectum for each device, and the difference between the device estimates for the pooled hospital populations
| Mean estimates of total dose | |||||||
|---|---|---|---|---|---|---|---|
| Space OAR | Rectafix | Difference | |||||
| Volume of rectum (%) | Mean | 95% CI | Mean | 95% CI | Mean | 95% CI | P |
| 1 | 79.5 | 74, 85 | 75.8 | 72.8, 78.9 | −3.7 | 10, 2.6 | 0.249 |
| 2 | 73.3 | 67.7, 79 | 70.2 | 66.7, 73.7 | −3.1 | −9.7, 3.5 | 0.359 |
| 5 | 63.1 | 57.1, 69.1 | 60.5 | 57, 64 | −2.6 | −9.6, 4.4 | 0.462 |
| 10 | 53.5 | 47.4, 59.6 | 49.2 | 45.9, 52.4 | −4.3 | −11.2, 2.5 | 0.216 |
| 20 | 39.8 | 34.6, 44.9 | 34.4 | 31.7, 37.1 | −5.4 | −11.1, 0.4 | 0.069 |
| 30 | 31.6 | 27.7, 35.6 | 26.0 | 23.7, 28.3 | −5.6 | −10.2, −1.1 | 0.016 |
| 40 | 27.2 | 23.4, 30.9 | 21.2 | 18.9, 23.5 | −6.0 | −10.3, −1.6 | 0.008 |
| 50 | 23.0 | 19.1, 26.9 | 15.7 | 13.3, 18.1 | −7.3 | −11.9, −2.7 | 0.002 |
| 60 | 19.1 | 14.8, 23.3 | 10.1 | 8, 12.2 | −9.0 | −13.8, −4.2 | <0.001 |
| 70 | 14.4 | 10, 18.9 | 6.1 | 4.7, 7.5 | −8.4 | −13, −3.7 | <0.001 |
| 80 | 9.4 | 6.6, 12.3 | 4.2 | 3.3, 5.1 | −5.3 | 8.2, −2.3 | <0.001 |