Table 1.
Descriptive statistics.
| Group |
||||||||
|---|---|---|---|---|---|---|---|---|
| Covariate | Statistics | Level | Photon+RS N = 50 |
Photon-RS N = 38 |
P-valuea | Proton+RS N = 50 |
Proton-RS N = 26 |
P-value |
| Race | N (Col %) | White | 26 (52.00) | 4 (10.81) | <.001 | 27 (69.23) | 11 (52.38) | .196 |
| N (Col %) | AA/other | 24 (48.00) | 33 (89.19) | 12 (30.77) | 10 (47.62) | |||
| T stage | N (Col %) | T1 | 43 (86.00) | 28 (73.68) | .370 | 34 (68.00) | 15 (57.69) | .061 |
| N (Col %) | T2 | 5 (10.00) | 6 (15.79) | 14 (28.00) | 5 (19.23) | |||
| N (Col %) | T3 | 2 (4.00) | 3 (7.89) | 2 (4.00) | 5 (19.23) | |||
| N (Col %) | T4 | 0 (0) | 1 (2.63) | 0 (0) | 1 (3.85) | |||
| ADT | N (Col %) | No | 25 (50.00) | 7 (18.42) | .002 | 24 (48.00) | 10 (38.46) | .428 |
| N (Col %) | Yes | 25 (50.00) | 31 (81.58) | 26 (52.00) | 16 (61.54) | |||
| Risk group | N (Col %) | Low | 1 (2.00) | 0 (0) | .045 | 7 (14.00) | 1 (3.85) | .244 |
| N (Col %) | Favorable intermediate | 17 (34.00) | 4 (10.53) | 14 (28.00) | 4 (15.38) | |||
| N (Col %) | Unfavorable intermediate | 19 (38.00) | 16 (42.11) | 16 (32.00) | 9 (34.62) | |||
| N (Col %) | High | 11 (22.00) | 15 (39.47) | 7 (14.00) | 8 (30.77) | |||
| N (Col %) | Very high | 2 (4.00) | 3 (7.89) | 6 (12.00) | 4 (15.38) | |||
| PSA (cat.) | N (Col %) | <10 | 28 (56.00) | 18 (47.37) | .489 | 39 (78.00) | 16 (61.54) | .036 |
| N (Col %) | ≥10-<20 | 15 (30.00) | 11 (28.95) | 10 (20.00) | 5 (19.23) | |||
| N (Col %) | ≥20 | 7 (14.00) | 9 (23.68) | 1 (2.00) | 5 (19.23) | |||
| Fields | N (Col %) | Prostate | 43 (86.00) | 25 (65.79) | .025 | 41 (82.00) | 16 (61.54) | .051 |
| N (Col %) | Prostate+Pelvis | 7 (14.00) | 13 (34.21) | 9 (18.00) | 10 (38.46) | |||
| Age | N | 50 | 38 | .035 | 50 | 26 | .578 | |
| Mean | 70.56 | 67 | 68.82 | 69.85 | ||||
| Median | 71 | 68 | 68.5 | 69 | ||||
| Min | 55 | 56 | 47 | 50 | ||||
| Max | 90 | 80 | 82 | 86 | ||||
| Std Dev | 8.89 | 5.89 | 7.38 | 8.02 | ||||
| PSA | N | 50 | 38 | .131 | 50 | 26 | .029 | |
| Mean | 11.87 | 15.63 | 8.5 | 14.85 | ||||
| Median | 9.62 | 10.20 | 7.65 | 6.53 | ||||
| Min | 2.65 | 3.40 | 3.7 | 3.4 | ||||
| Max | 56 | 58.80 | 35.60 | 93.10 | ||||
| Std Dev | 9.03 | 14.05 | 5.10 | 18.95 | ||||
Notes: Baseline demographics for photon and proton-treated patients.
Abbreviations: Photon+RS, photon with rectoprostatic hydrogel; Photon-RS, photon without rectoprostatic hydrogel; Proton+RS, proton with rectoprostatic hydrogel; Proton-RS, proton without rectoprostatic hydrogel; ADT, androgen deprivation therapy; and PSA, prostate-specific antigen; AA, African American. P values <0.05 included in bold.
a
The P-value is calculated by analysis of variance for numerical covariates and the χ2 test or Fisher exact test for categorical covariates.