Table 2 Single-factor analysis of the patients' basic situations and MRI indicators
| Â | Intraoperative performance | |||
|---|---|---|---|---|
Variable n (%) | Total (N = 165) | Group II (segmental/partial IVC excision) (N = 99) | Group I (IVC wall was not resected) (N = 66) | P |
Sex | 0.075 | |||
 Male | 113(68.5) | 73(73.7) | 40(60.6) |  |
 Female | 52(31.5) | 26(26.3) | 26(39.4) |  |
Age | 59.0(51.0–66.0) | 59.0(50.0–66.0) | 60.5(51.0–67.0) | 0.751 |
IVCTT morphology |  < .001 | |||
 Type I–III | 100(60.6) | 41(41.4) | 59(89.4) |  |
 Types IV and V | 65(39.4) | 58(58.6) | 7(10.6) |  |
Mayo grade |  < .001 | |||
 I | 42(25.5) | 9(9.1) | 33(50.0) |  |
 II | 99(60.0) | 71(71.7) | 28(42.4) |  |
 III | 9(5.5) | 8(8.1) | 1(1.5) |  |
 IV | 15(9.1) | 11(11.1) | 4(6.1) |  |
Length of IVCTT (cm) | 5.8(3.8–8.7) | 6.8(5.2–9.7) | 3.8(2.5–6.1) |  < .001 |
Maximum axis diameter (cm) | 2.9 ± 1.1 | 3.3 ± 1.0 | 2.3 ± 1.0 |  < .001 |
Bland thrombus |  < .001 | |||
 Yes | 53(32.1) | 46(46.5) | 7(10.6) |  |
 No | 112(67.9) | 53(53.5) | 59(89.4) |  |
Bland thrombus lengtha (cm) | 0.0(0.0–2.7) | 0.0(0.0–6.7) | 0.0(0.0–0.0) |  < .001 |
Preliminary MRI-based diagnosis of renal tumors |  < .001 | |||
 Group A | 89(53.9) | 41(41.4) | 48(72.7) |  |
 Group B | 76(46.1) | 58(58.6) | 18(27.3) |  |
Contralateral renal vein involvement |  < .001 | |||
 Yes | 23(13.9) | 21(21.2) | 2(3.0) |  |
 No | 142(86.1) | 78(78.8) | 64(97.0) |  |