Table 1.
Pretreatment patient characteristics stratified by risk status
| Patient Characteristics Stratified by Risk Status | ||||
|---|---|---|---|---|
| Characteristics | Overall (n=1092) | High-Risk Status (n=255) | Low-Risk Status (n=837) | P-value |
| PATIENT LEVEL | ||||
| Age (yrs) (mean ± SD; range) | 59.2 ± 11.9; 22-89 | 69 ± 10.0; 37-89 | 56.2 ± 10.7; 22-75 | <0.001 |
| Gender | 0.581 | |||
| Male | 701 (64.2) | 160 (62.8) | 541 (64.6) | |
| Race | 0.956 | |||
| White | 939 (86) | 219 (85.8) | 720 (86.0) | |
| Non-white | 153 (14) | 36 (14.1) | 117 (14) | |
| ECOG PS | <0.001 | |||
| 0 | 1056 (96.7) | 235 (92.2) | 821 (98.1) | |
| ≥ 1 | 36 (3.3) | 20 (7.8) | 16 (1.9) | |
| BMI (kg/m2) | 30.3 ± 7.2 | 30.0±6.2 | 30.4±7.5 | 0.516 |
| CCI (mean ± SD) | 1.2 ± 1.6 | 3.3±1.7 | 0.6±0.8 | <0.001 |
| Bilateral tumors | 126 (11.5) | |||
| Solitary Kidney | 60 (5.5) | 32 (12.6) | 28 (3.4) | <0.001 |
| High-risk Status | 255 (23.4) | 255 (23.4) | 837 (76.6) | - |
| TUMOR LEVEL | ||||
| Clinical stage | 0.789 | |||
| T1 | 967 (88.6) | 227 (89.0) | 740 (88.4) | |
| T2 | 125 (11.5) | 28 (11.0) | 97 (11.6) | |
| Maximal Tumor Size (cm) | 4.2±2.9 | 4.4±2.7 | 4.1±3.0 | 0.208 |
| Nephrometry Score | 7.8 ± 2.0 | 7.7±2.0 | 7.8±2.0 | 0.499 |
| Nephrometry Score | 0.921 | |||
| Complexity Group | ||||
| Low (NS 4-6) | 228 (20.9) | 54 (21.2) | 174 (20.8) | |
| Intermediate (NS 7-9) | 445 (40.8) | 103 (40.4) | 342 (40.9) | |
| High (NS 10-12) | 205 (18.8) | 45 (17.7) | 160 (19.1) | |
| Missing data | 214 (19.6) | 53 (20.8) | 161 (19.2) | |
| Hilar Tumor Designation | 149 (13.6) | 31 (12.2) | 118 (14.1) | 0.676 |
| OPERATIVE LEVEL | ||||
| Operative Time (min) | 189±62 | 187±61 | 189±62 | 0.660 |
| EBL (mL) | 179±257 | 175±245 | 180±261 | 0.769 |
| Surgery Type | 0.004 | |||
| Partial Nx | 785 (71.9) | 165 (64.7) | 620 (74.1) | |
| Radical Nx | 307 (28.1) | 90 (35.3) | 217 (25.9) | |
| MIS | 679 (62.2) | 147 (57.7) | 532 (63.6) | 0.088 |
BMI, body mass index; CCI, Charlson comorbidity index; EBL, estimated blood loss; ECOG, Eastern Cooperative Oncology Group; NS, tumor nephrometry score; SD, standard deviation. High-risk status was defined by CCI >2 or age >75 years. Data presented as n (%) excluding patients with missing data, unless otherwise noted.