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Spearman’s rank correlation coefficient between the rectal dose reduction rate and CTV volume
| Spearman’s rank correlation coefficient | ||||
|---|---|---|---|---|
| D80% | D50% | D20% | D2% | |
| 3DCRT | 0.0286 | −0.0827 | 0.1519 | 0.4256 |
| VMAT | 0.1008 | −0.0481 | −0.2030 | −0.1489 |
| HT | 0.0045 | 0.0301 | −0.1940 | 0.1308 |
| CK | 0.0090 | −0.0632 | −0.3182 | 0.4662 |
| Proton | −0.2248 | −0.1669 | −0.2977 | 0.0496 |
