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Table 2 Correlations between characteristics of patients with liver metastasis in the training and testing groups

From: A novel nomogram for predicting liver metastasis in patients with gastrointestinal stromal tumor: a SEER-based study

Characteristics Training set (%) Testing set (%)
Negative Positive P Negative Positive P
Age 62.18 ± 13.77 61.67 ± 14.86 0.560 62.41 ± 13.62 62.10 ± 11.96 0.802
Sex     < 0.001    0.004
 Male 1238(48.9) 193(60.3)   408(48.6) 69(63.3)  
 Female 1291(51.1) 127(39.7)   431(51.4) 40(36.7)  
Marriage    0.254    0.818
 Married 1442(57.0) 167(52.1)   474(56.4) 60(55.0)  
 Unmarried 960(37.9) 136(42.5)   308(36.7) 43(39.4)  
 Unknown 127(5.1) 17(5.4)   57(6.9) 6(5.6)  
Race    0.144     < 0.001
 White 1695(67.0) 214(66.8)   556(66.2) 69(63.4)  
 Black 451(17.8) 68(21.2)   145(17.2) 20(18.3)  
 Others 383(15.2) 38(12.0)   138(16.6) 20(18.3)  
Tumor location     < 0.001     < 0.001
 Stomach 1026(40.5) 93(29.0)   357(42.5) 33(30.2)  
 Duodenum 140(5.5) 18(5.6)   51(6.0) 4(3.6)  
 Jejunum 186(7.3) 22(6.8)   59(7.0) 5(4.5)  
 Ileum 83(3.2) 3(0.9)   16(2.1) 2(1.8)  
 Colon 51(2.0) 9(2.8)   18(2.1) 1(0.9)  
 Rectum 75(2.9) 4(1.2)   23(2.7) 2(1.8)  
 Others 266(10.5) 74(23.1)   85(10.1) 32(29.1)  
 Unknown 702(28.1) 97(30.6)   228(27.5) 32(29.1)  
Tumor size     < 0.001     < 0.001
  ≤ 2 cm 338(13.3) 18(5.6)   86(10.2) 4(3.6)  
 2–5 cm 755(29.8) 42(13.1)   256(30.5) 13(11.9)  
 5–10 cm 766(30.2) 73(22.8)   221(26.3) 28(25.6)  
  > 10 cm 534(21.1) 111(34.6)   215(25.6) 36(33.3)  
 Unknown 136(5.6) 76(23.9)   61(7.4) 28(25.6)  
N stage     < 0.001     < 0.001
 N0 2412(95.3) 246(77.0)   791(94.2) 82(75.2)  
 N1 60(2.4) 37(11.5)   28(3.3) 6(5.5)  
 Unknown 57(2.3) 37(11.5)   20(2.5) 21(19.3)  
Mitotic rate     < 0.001     < 0.001
  < 5/50HPFs 1329(52.5) 57(17.5)   428(51.0) 21(19.2)  
  ≥ 5/50HPFs 557(22.0) 53(16.5)   187(22.2) 17(15.5)  
 Unknown 643(25.5) 210(66.0)   224(26.8) 71(65.3)  
  1. HPFs high power fields