Table 4.
Adjusted ORs (AORs) of RARP versus non-RARP by patient characteristics stratified by hospital RARP surgery volume
| High-RARP-volume (≥500 cases) | Medium-RARP-volume (200–499 cases) | Low-RARP-volume (≤199 cases) | ||||
|---|---|---|---|---|---|---|
| AOR (95% CI) | p Value | AOR (95% CI) | p Value | AOR (95% CI) | p Value | |
| Independent variables | ||||||
| Race/ethnicity (ref.=non-Hispanic white) | ||||||
| Non-Hispanic black | 0.87 (0.560 to 1.358) | 0.545 | 0.94 (0.643 to 1.381) | 0.760 | 0.86 (0.654 to 1.129) | 0.277 |
| Hispanic | 0.96 (0.611 to 1.517) | 0.871 | 1.04 (0.794 to 1.367) | 0.767 | 0.93 (0.752 to 1.152) | 0.509 |
| Other | 1.47 (0.873 to 2.484) | 0.147 | 1.02 (0.777 to 1.340) | 0.885 | 1.21 (0.916 to 1.595) | 0.180 |
| Insurance (ref.=private) | ||||||
| Medicare | 0.78 (0.505 to 1.205) | 0.264 | 0.85 (0.649 to 1.119) | 0.250 | 0.97 (0.775 to 1.204) | 0.755 |
| Medicaid | 0.09 (0.050 to 0.163)** | <0.001 | 0.51 (0.280 to 0.915)* | 0.024 | 1.27 (0.759 to 2.116) | 0.365 |
| Other† | 0.38 (0.176 to 0.840)* | 0.017 | 0.64 (0.395 to 1.049) | 0.077 | 1.28 (0.631 to 2.597) | 0.493 |
| Median household Income (ref.=1, lowest) | ||||||
| 2, middle-low | 0.79 (0.510 to 1.227) | 0.295 | 0.90 (0.657 to 1.228) | 0.500 | 0.99 (0.787 to 1.253) | 0.053 |
| 3, middle-high | 0.96 (0.634 to 1.450) | 0.843 | 0.69 (0.506 to 0.927)* | 0.014 | 0.81 (0.642 to 1.018) | 0.071 |
| 4, highest | 1.07 (0.710 to 1.614) | 0.744 | 0.53 (0.393 to 0.707)** | <0.001 | 0.72 (0.572 to 0.913)** | 0.007 |
| Sample size | ||||||
| Hospital | 6 | 15 | 52 | |||
| Patient | 6322 | 5649 | 4450 | |||
Dependent variable is a binary code of receiving RARP (=1) versus not receiving RARP (=0).
High-volume hospitals are those that performed more than 500 RARPs during the study period, medium-volume-hospitals are those that performed between 200 and 499 RARPs during the study period, and low-volume-hospitals are those that performed fewer than 200 RARPs during the study period. Results are also adjusted for patient's age, geographic location, comorbidity, year of the procedure, and hospital characteristics (ownership, teaching status, bed size).
†Dependent variables for model 2 (RARP-performing hospital model) was a patient-level robotic surgery binary code (=1 if a patient underwent RARP).
*p<0.05; **p<0.01.
RARP, Robot-assisted radical prostatectomy.