Factor | Unmatched cohort | Matched cohort | ||||||
---|---|---|---|---|---|---|---|---|
ORP | RARP | P value | Standardised difference | ORP | RARP | P value | Standardised difference | |
N | 971 | 2663 | Â | Â | 3634 | 3634 | Â | Â |
Age at surgery, mean (SD) | 64.9 (6.8) | 64.3 (7.1) | 0.028 | − 8.3% | 64.4 (6.9) | 64.7 (7.0) | 0.100 | 3.8% |
PSA at surgery, mean (SD) | 8.4 (6.4) | 7.9 (7.4) | 0.033 | − 8.3% | 7.9 (6.1) | 8.0 (8.1) | 0.510 | 1.5% |
Surgeon years since specialisation, mean (SD) | 16.4 (9.3) | 15.8 (11.3) | 0.120 | − 6.0% | 16.5 (8.4) | 16.4 (11.5) | 0.540 | − 1.4% |
NCCN category | Â | Â | Â | Â | Â | Â | Â | Â |
Low risk | 85 (8.8%) | 240 (9.0%) |  < 0.001 |  | 325 (8.9%) | 321 (8.8%) | 0.630 |  |
Intermediate risk | 617 (63.5%) | 1853 (69.6%) |  | 12.8% | 2488 (68.5%) | 2479 (68.2%) |  | − 0.5% |
High risk | 236 (24.3%) | 526 (19.8%) |  | − 11.0% | 733 (20.2%) | 760 (20.9%) |  | 1.8% |
Metastatic | 33 (3.4%) | 44 (1.7%) |  | − 11.1% | 88 (2.4%) | 74 (2.0%) |  | − 2.6% |
Hospital location | Â | Â | Â | Â | Â | Â | Â | Â |
Metropolitan | 690 (71.1%) | 2493 (93.6%) |  < 0.001 |  | 3161 (87.0%) | 3184 (87.6%) | 0.420 |  |
Regional | 281 (28.9%) | 170 (6.4%) |  | − 61.9% | 473 (13.0%) | 450 (12.4%) |  | − 1.9% |
Hospital type | Â | Â | Â | Â | Â | Â | Â | Â |
Public | 351 (36.1%) | 366 (13.7%) |  < 0.001 |  | 715 (19.7%) | 697 (19.2%) | 0.590 |  |
Private | 620 (63.9%) | 2297 (86.3%) | Â | 53.6% | 2919 (80.3%) | 2937 (80.8%) | Â | 1.3% |
IRSAD category | Â | Â | Â | Â | Â | Â | Â | Â |
1—lowest | 112 (11.5%) | 224 (8.4%) |  < 0.001 |  | 274 (7.5%) | 376 (10.3%) |  < 0.001 |  |
2 | 150 (15.4%) | 272 (10.2%) |  | − 15.7% | 395 (10.9%) | 391 (10.8%) |  | − 0.4% |
3 | 175 (18.0%) | 345 (13.0%) |  | − 14.0% | 515 (14.2%) | 528 (14.5%) |  | 1.0% |
4 | 195 (20.1%) | 652 (24.5%) |  | 10.6% | 937 (25.8%) | 819 (22.5%) |  | − 7.6% |
5—highest | 339 (34.9%) | 1170 (43.9%) |  | 18.5% | 1513 (41.6%) | 1520 (41.8%) |  | 0.4% |
Year of surgery | Â | Â | Â | Â | Â | Â | Â | Â |
2014 | 153 (15.8%) | 417 (15.7%) | 0.230 | Â | 467 (12.9%) | 552 (15.2%) | 0.040 | Â |
2015 | 194 (20.0%) | 598 (22.5%) | Â | 6.1% | 759 (20.9%) | 763 (21.0%) | Â | 0.3% |
2016 | 275 (28.3%) | 709 (26.6%) |  | − 3.8% | 995 (27.4%) | 960 (26.4%) |  | − 2.2% |
2017 | 287 (29.6%) | 807 (30.3%) |  | 1.6% | 1193 (32.8%) | 1126 (31.0%) |  | − 4.0% |
2018 | 62 (6.4%) | 132 (5.0%) |  | − 6.2% | 220 (6.1%) | 233 (6.4%) |  | 1.5% |