Table 4.
Multivariate clinical models of ABO blood group system predicting the risk of positive surgical margins (SM) in 1114 prostate cancer patients treated with robot-assisted radical prostatectomy (RARP)
| Multivariate model | |||||||
|---|---|---|---|---|---|---|---|
| Total | NSM | PSM | PSM vs NSM; Model I* | PSM vs NSM; Model II** | |||
| n | n (%) | n (%) | OR (95% CI) | p value | OR (95% CI) | p value | |
| Blood group system | |||||||
| A | 467 | 376 (80.5) | 91 (19.5) | Ref | Ref | ||
| O | 467 | 325 (69.6) | 142 (30.4) | 1.820 (1.344–2.464) | < 0.0001 | 1.842 (1.352–2.509) | < 0.0001 |
| Assessing the fit of | Model I | Model II | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Group | Total | NSM | PSM | Total | NSM | PSM | ||||
| Observed | Predicted | Observed | Predicted | Observed | Predicted | Observed | Predicted | |||
| 1 | 112 | 92 | 94.3 | 20 | 17.7 | 111 | 100 | 98 | 11 | 13 |
| 2 | 113 | 93 | 92.6 | 20 | 20.4 | 111 | 93 | 93.9 | 18 | 17.1 |
| 3 | 110 | 84 | 88.7 | 26 | 21.3 | 111 | 91 | 91.8 | 20 | 19.2 |
| 4 | 108 | 86 | 85.7 | 22 | 22.3 | 111 | 97 | 89.7 | 14 | 21.3 |
| 5 | 111 | 94 | 86.7 | 17 | 24.3 | 111 | 82 | 87.1 | 29 | 23.9 |
| 6 | 110 | 82 | 83.6 | 28 | 26.4 | 111 | 87 | 84.6 | 24 | 26.4 |
| 7 | 116 | 82 | 84.5 | 34 | 31.5 | 111 | 83 | 81.9 | 28 | 29.1 |
| 8 | 111 | 83 | 78.2 | 28 | 32.4 | 111 | 76 | 78.5 | 35 | 32.3 |
| 9 | 111 | 83 | 75.7 | 28 | 35.3 | 111 | 72 | 74.2 | 39 | 36.8 |
| 10 | 112 | 64 | 72.9 | 48 | 39.1 | 115 | 62 | 63.3 | 53 | 51.7 |
| Total | 1114 | 1114 | ||||||||
See also Table 1. Test of Hosmer–Lemeshow: (a) Model I: Chi-squared 11.109; degree freedom = 8; p = 0.196, overall accuracy 75.7%; (b) Model II: Chi-squared 5.842, degree freedom = 8, p = 0.665, overall accuracy 76.1%
NSM negative SM, PSM positive SM, OR odds ratio, CI confidence interval
*Model adjusted for blood group B, blood group AB and BMI
**Model adjusted for blood group B, blood group AB, BMI, PSA, PV and BPC