Table 2 Univariate analysis to differentiate between high and low Ki-67 PI groups in the training set
Variables | High Ki-67 PI group (Ki-67 PI ≥ 50%, n = 35) | Low Ki-67 PI group (Ki-67 PI < 50%, n = 83) | F/Z/c² | p |
|---|---|---|---|---|
Age, y | 65(58,70) | 22.49(21.33,24.31) | −1.182 | 0.237 |
BMI | 22.49(21.33,24.31) | 21.87(20.80,24.72) | −0.884 | 0.377 |
Gender, n (%) | Â | Â | 3.619 | 0.391 |
 Male | 67(56.8) | 28(56.0) |  |  |
 Female | 51(43.2) | 22(44.0) |  |  |
CA19-9, n (%) | Â | Â | 84.828 | <0.001 |
 Normal | 47(39.8) | 13(26.0) |  |  |
 Elevated | 71(60.2) | 37(74.0) |  |  |
CEA, n (%) | Â | Â | 5.503 | 0.205 |
 Normal | 90(76.3) | 32(64.0) |  |  |
 Elevated | 28(23.7) | 18(36.0) |  |  |
CA125, n (%) | Â | Â | 1.268 | 0.543 |
 Normal | 79(66.9) | 31(62.0) |  |  |
 Elevated | 39(33.1) | 19(38.0) |  |  |
CT-reported T stage | Â | Â | 2.795 | 0.275 |
 T1-2 | 45(38.1) | 17(34.0) |  |  |
 T3-4 | 73(61.9) | 33(66.0) |  |  |
CT-reported regional LN status | Â | Â | Â | Â |
 Negative | 65(55.1) | 29(58.0) | 3.990 | <0.001 |
 Positive | 53(44.9) | 21(42.0) |  |  |
vascular invasion | Â | Â | 12.993 | 0.056 |
 Negative | 53(44.9) | 18(36.0) |  |  |
 Positive | 65(55.1) | 32(64.0) |  |  |
extrapancreatic perineural invasion | Â | Â | 28.635 | 0.029 |
 Negative | 41(34.7) | 12(24.0) |  |  |
 Positive | 77(65.3) | 38(76.0) |  |  |
Radiomics signature | 3.75 ± 2.79 | −3.67 ± 4.66 | 3.656 | <0.001 |