Table 1. Baseline Demographic Characteristics of Patients Undergoing ORP or RARP Before and After Inverse Probability of Treatment Weighting Adjustment.
| Variable | IPTW, No. (%) | ||||||
|---|---|---|---|---|---|---|---|
| Before | After | ||||||
| All (n = 11457) | ORP (n = 1604) | RARP (n = 9853) | P value | ORP (n = 1604) | RARP (n = 9853) | P value | |
| Age, y | |||||||
| 18-44 | 160 (1.4) | 27 (1.7) | 133 (1.3) | .04 | 24 (1.5) | 137 (1.4) | .95 |
| 45-54 | 2830 (24.7) | 358 (22.3) | 2472 (25.1) | 393 (24.5) | 2433 (24.7) | ||
| 55-64 | 8467 (73.9) | 1219 (76.0) | 7248 (73.6) | 1184 (73.8) | 7282 (73.9) | ||
| Income/y | |||||||
| >$40 000 | 2253 (19.7) | 243 (15.1) | 2010 (20.4) | <.001 | 301 (18.8) | 1936 (19.6) | .49 |
| Insurance plan | |||||||
| Capitated | 1337 (11.7) | 190 (11.8) | 1147 (11.6) | .007 | 188 (11.7) | 1150 (11.7) | >.99 |
| Comprehensive | 581 (5.1) | 77 (4.8) | 504 (5.1) | 78 (4.9) | 499 (5.1) | ||
| Noncapitated POS | 810 (7.1) | 147 (9.2) | 663 (6.7) | 119 (7.4) | 697 (7.1) | ||
| PPO | 6663 (58.2) | 932 (58.1) | 5731 (58.2) | 927 (57.8) | 5728 (58.1) | ||
| Others | 1921 (16.8) | 240 (15.0) | 1681 (17.1) | 268 (16.7) | 1652 (16.8) | ||
| Unknown | 145 (1.3) | 18 (1.1) | 127 (1.3) | 20 (1.2) | 124 (1.3) | ||
| Nonmetropolitan status | 1631 (14.2) | 301 (18.8) | 1330 (13.5) | <.001 | 224 (14.0) | 1404 (14.2) | .80 |
| Region | |||||||
| North Central | 2903 (25.3) | 327 (20.4) | 2576 (26.1) | <.001 | 401 (25.1) | 2496 (25.3) | >.99 |
| Northeast | 2031 (17.7) | 267 (16.6) | 1764 (17.9) | 280 (17.5) | 1746 (17.7) | ||
| South | 4920 (42.9) | 807 (50.3) | 4113 (41.7) | 693 (43.2) | 4231 (42.9) | ||
| West | 1508 (13.2) | 178 (11.1) | 1330 (13.5) | 212 (13.2) | 1297 (13.2) | ||
| Unknown | 95 (0.8) | 25 (1.6) | 70 (0.7) | 12 (0.7) | 81 (0.8) | ||
| Procedure year | |||||||
| 2013 | 2291 (20.0) | 399 (24.9) | 1892 (19.2) | <.001 | 321 (20.0) | 1969 (20.0) | >.99 |
| 2014 | 2679 (23.4) | 411 (25.6) | 2268 (23.0) | 375 (23.4) | 2304 (23.4) | ||
| 2015 | 2628 (22.9) | 346 (21.6) | 2282 (23.2) | 363 (22.6) | 2259 (22.9) | ||
| 2016 | 2027 (17.7) | 250 (15.6) | 1777 (18.0) | 287 (17.9) | 1744 (17.7) | ||
| 2017 | 1832 (16.0) | 198 (12.3) | 1634 (16.6) | 254 (15.8) | 1575 (16.0) | ||
| Tobacco abuse/history | 922 (8.0) | 125 (7.8) | 797 (8.1) | .72 | 131 (8.2) | 793 (8.0) | .85 |
| Charlson comorbidity | |||||||
| 0 | 1795 (15.7) | 982 (61.2) | 6059 (61.5) | .45 | 988 (61.6) | 6055 (61.4) | .86 |
| 1 | 7041 (61.5) | 355 (22.1) | 2266 (23.0) | 371 (23.1) | 2255 (22.9) | ||
| ≥2 | 2621 (22.9) | 267 (16.6) | 1528 (15.5) | 242 (15.1) | 1542 (15.7) | ||
| Lymph node dissection | 5270 (46.0) | 794 (49.5) | 4476 (45.4) | .003 | 732 (45.6) | 4529 (46.0) | .88 |
| Baseline payment | |||||||
| Median (IQR) | 6939 (4466-11 197) | 6804 (4261-11 124) | 6954 (4498-11 207) | .23 | NA | NA | NA |
| Mean (SD) | 9806 (12 615) | 9896 (14 769) | 9792 (12 229) | .76 | NA | NA | NA |
Abbreviations: IPTW, inverse probability of treatment weighting; IQR, interquartile range; NA, not applicable; ORP, open radical prostatectomy; RARP, robotic-assisted radical prostatectomy; POS, point of service; PPO, preferred provider organization.