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Table 1 Clinical characteristics of ccRCC patients

From: Epigenetic signature predicts overall survival clear cell renal cell carcinoma

Variable Training set Testing set Entire set Chi-square Test
n = 213 n = 106 n = 319 χ2 P
No. (%) No. (%) No. (%)   
Censor 65 (30.5) 40 (37.7) 105 (32.9)   
Age (years)
 ≥ 65 75 (35.2) 36 (34.0) 111 (34.8) 0.049 0.825
 < 65 138 (64.8) 70 (66.0) 208 (65.2)   
Gender
 Female 80 (37.6) 34 (32.1) 114 (35.7) 0.927 0.336
 Male 133 (62.4) 72 (67.9) 205 (64.3)   
Pathological stage
 Stage I 106 (49.8) 49 (46.2) 155 (48.6) 1.766 0.779
 Stage II 22 (10.3) 9 (8.5) 31 (9.7)   
 Stage III 49 (23.0) 24 (22.6) 73 (22.9)   
 Stage IV 35 (16.4) 23 (21.7) 58 (18.2)   
 NA 1 (0.5) 1 (0.9) 2 (0.6)   
Histologic grade
 Grade I 6 (2.8) 3 (2.8) 9 (2.8) 4.684 0.321
 Grade II 93 (43.7) 40 (30.7) 133 (41.7)   
 Grade III 75 (35.2) 48 (45.3) 123 (38.6)   
 Grade IV 35 (16.4) 15 (14.2) 50 (15.7)   
 NA 4 (1.9) 0 (0.0) 4 (1.3)   
Lymph node metastasis
 Positive 38 (17.8) 23 (21.7) 61 (19.1) 0.681 0.409
 Negative 175 (82.2) 83 (78.3) 258 (80.9)   
  1. Here Chi-square and p-value were the values obtained by comparison between the training set and the testing set