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Table 1 Clinical characteristics of patients in the training cohort and validation cohort

From: Personalized CT-based radiomics nomogram preoperative predicting Ki-67 expression in gastrointestinal stromal tumors: a multicenter development and validation cohort

  Training cohort Internal validation cohort External validation cohort
Low expression High expression P* Low expression High expression P* Low expression High expression P*
N = 100 N = 48   N = 29 N = 12   N = 116 N = 34  
Age, mean ± SD, years 62.2 ± 12.66 63.08 ± 12.03 0.683 63 ± 13.1 60.17 ± 12.76 0.53 61.81 ± 10.30 59.91 ± 9.99 0.649
Sex    1.000    0.629    0.960
 Female 47 (47.00%) 22 (45.83%)   14 (48.28%) 4 (33.33%)   71 (61.21%) 20 (58.82%)  
 Male 53 (53.00%) 26 (54.17%)   15 (51.72%) 8 (66.67%)   45 (38.79%) 14 (41.18%)  
Location    0.662    0.184    0.007
 Intestine 37 (37.00%) 21 (43.75%)   10 (34.48%) 7 (58.33%)   20 (17.24%) 14 (41.18%)  
 Stomach 63 (63.00%) 27 (56.25%)   19 (65.52%) 5 (41.67%)   96 (82.76%) 20 (58.82%)  
Size (cm)    < 0.001    < 0.001    < 0.001
  ≤ 2 13 (13.00%) 1 (2.08%)   4 (13.79%) 0 (0%)   21 (18.1%) 1 (2.94%)  
  2–5 54 (54.00%) 13 (27.08%)   14 (48.28%) 1 (8.33%)   68 (58.62%) 11 (32.35%)  
  5–10 28 (28.00%) 19 (39.58%)   8 (27.59%) 4 (33.33%)   27 (23.28%) 15 (44.12%)  
  > 10 5 (5.00%) 15 (31.25%)   3 (10.34%) 7 (58.33%)   0 (0) 7 (20.59%)  
  1. * P value is calculated for difference of clinical characteristics between patients with low expression of Ki67 and patients with high expression of Ki67 by using the univariate analysis