| | Variables | Total (n = 246) | Training set (n = 196) | Testing set (n = 50) | Statistics | |
| | Gender, n (%) | | | | χ2 = 1.597 | 0.206 | | Male | 143 (58.13) | 110 (56.12) | 33 (66.00) | | | | Female | 103 (41.87) | 86 (43.88) | 17 (34.00) | | | | Past history of hypertension, n (%) | | | | χ2 = 0.194 | 0.659 | | No | 126 (51.22) | 99 (50.51) | 27 (54.00) | | | | Yes | 120 (48.78) | 97 (49.49) | 23 (46.00) | | | | Past history of diabetes, n (%) | | | | χ2 = 0.049 | 0.825 | | No | 174 (70.73) | 138 (70.41) | 36 (72.00) | | | | Yes | 72 (29.27) | 58 (29.59) | 14 (28.00) | | | | Family cancer history, n (%) | | | | Fisher | 0.208 | | No | 229 (93.09) | 180 (91.84) | 49 (98.00) | | | | Yes | 17 (6.91) | 16 (8.16) | 1 (2.00) | | | | History of intestinal inflammatory diseases, n (%) | | | | Fisher | 1.000 | | No | 244 (99.19) | 194 (98.98) | 50 (100.00) | | | | Yes | 2 (0.81) | 2 (1.02) | 0 (0.00) | | | | Smoking history, n (%) | | | | χ2 = 5.059 | 0.080 | | Never smoking | 145 (58.94) | 121 (61.73) | 24 (48.00) | | | | Smoking | 80 (32.52) | 62 (31.63) | 18 (36.00) | | | | Quit smoking | 21 (8.54) | 13 (6.63) | 8 (16.00) | | | | Drinking history, n (%) | | | | χ2 = 2.351 | 0.309 | | Never drinking | 188 (76.42) | 154 (78.57) | 34 (68.00) | | | | Drinking | 51 (20.73) | 37 (18.88) | 14 (28.00) | | | | Quit drinking | 7 (2.85) | 5 (2.55) | 2 (4.00) | | | | Hemoglobin, Mean ± SD | 126.62 ± 28.66 | 125.71 ± 28.25 | 130.20 ± 30.24 | t = 0.99 | 0.324 | | Total cholesterol, mean ± SD | 4.52 ± 1.28 | 4.50 ± 1.27 | 4.59 ± 1.34 | t = 0.47 | 0.637 | | Triglycerides, M (Q1, Q3) | 1.30 (0.98, 1.76) | 1.29 (0.97, 1.70) | 1.38 (1.01, 1.94) | Z = 0.952 | 0.341 | | Low density lipoprotein, M (Q1, Q3) | 2.91 (2.30, 3.56) | 2.89 (2.32, 3.56) | 2.99 (2.09, 3.79) | Z = 0.092 | 0.926 | | High density lipoprotein, M (Q1, Q3) | 1.04 (0.86, 1.26) | 1.04 (0.86, 1.26) | 1.03 (0.87, 1.27) | Z = -0.049 | 0.961 | | Fecal occult blood test, n (%) | | | | χ2 = 0.454 | 0.501 | | No | 148 (60.16) | 120 (61.22) | 28 (56.00) | | | | Yes | 98 (39.84) | 76 (38.78) | 22 (44.00) | | | | Carcinoembryonic antigen, M (Q1, Q3) | 2.66 (1.81, 5.29) | 2.66 (1.88, 5.17) | 2.65 (1.55, 7.01) | Z = -0.483 | 0.629 | | Alpha-fetoprotein, M (Q1, Q3) | 2.53 (1.88, 3.68) | 2.51 (1.88, 3.70) | 2.57 (1.88, 3.32) | Z = -0.354 | 0.723 | | Saccharide antigen 199, M (Q1, Q3) | 9.88 (2.78, 22.28) | 11.28 (2.81, 23.14) | 7.34 (2.51, 20.89) | Z = -1.204 | 0.229 | | Rectal cancer, n (%) | | | | χ2 = 0.058 | 0.809 | | No | 161 (65.45) | 129 (65.82) | 32 (64.00) | | | | Yes | 85 (34.55) | 67 (34.18) | 18 (36.00) | | |
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