Table 3 Difference analysis of the training set

Peritoneal cytology

<0.001

 Negative

1562 (80.9%)

143 (30.2%)

 Suspicious

75 (3.9%)

21 (4.4%)

 Positive

293 (15.2%)

310 (65.4%)

Year of diagnosis

0.447

 2010-2013

595 (30.8%)

145 (30.6%)

 2014-2017

642 (33.3%)

171 (36.1%)

 2018-1021

693 (35.9%)

158 (33.3%)

Race

0.932

 Whites

1284 (66.5%)

308 (65%)

 Blacks

455 (23.6%)

117 (24.7%)

 Asian or Pacific Islander

178 (9.2%)

46 (9.7%)

 Native American/Alaska Native

13 (0.7%)

3 (0.6%)

Grade

<0.001

 G1

76 (3.9%)

4 (0.8%)

 G2

91 (4.7%)

10 (2.1%)

 G3

1763 (91.3%)

460 (97%)

T-7th

<0.001

 T1/T2

1517 (78.6%)

72 (15.2%)

 T3/T4

413 (21.4%)

402 (84.8%)

N-7th

<0.001

 N0

1473 (76.3%)

255 (53.8%)

 N1

281 (14.6%)

120 (25.3%)

 N2

176 (9.1%)

99 (20.9%)

Marital status

0.066

 married

1002 (51.9%)

269 (56.8%)

 others

928 (48.1%)

205 (43.2%)

Median household income

0.303

 <50000

126 (6.5%)

39 (8.2%)

 50000-90000

1169 (60.6%)

291 (61.4%)

 >90000

635 (32.9%)

144 (30.4%)

Urban-rural coding

0.872

 An urban area with a population of 1 million or more

1137 (58.9%)

290 (61.2%)

 Metropolitan areas with a population of 25-1 million

444 (23%)

102 (21.5%)

 Metropolitan areas with a population of less than 250,000

144 (7.5%)

31 (6.5%)

 Non-metropolitan area and adjacent

120 (6.2%)

31 (6.5%)

 Non-metropolitan area and not adjacent

85 (4.4%)

20 (4.2%)

 Time from diagnosis to treatment (day)

28（15-42）

23（8-36）

<0.001

 Tumor size

57（40-80）

75（55-100）

<0.001

 Age

67（61-73）

65（59-72）

<0.001