Table 2.

Clinicopathologic features of the patients

 Training setTest set
Biopsy sampleWashing fluidBiopsy sampleWashing fluid
IT (n = 52)NI (n = 98)PNormal (n = 187)IT (n = 36)NI (n = 34)PNormal (n = 18)IT (n = 20)NI (n = 21)PIT (n = 23)NI (n = 24)P
Demographics
 Age67.466.70.72067.268.864.70.10159.669.369.60.55370.369.30.707
 Male16 (30.8%)24 (24.5%)126 (67.4%)22 (61.1%)25 (73.5%)9 (50.0%)14 (70%)14 (66.7%)14 (60.9%)17 (70.8%)
 Female36 (69.2%)74 (75.5%)0.40861 (32.6%)14 (38.9%)9 (26.5%)0.2699 (50.0%)6 (30%)7 (33.3%)0.3329 (39.1%)7 (29.2%)0.213
Tumor size
 ≥25 mm31 (59.6%)12 (12.2%)27 (75%)5 (14.7%)15 (75%)3 (14.3%)18 (78.3%)3 (12.5%)
 <25 mm21 (40.4%)86 (87.8%)<0.0019 (25%)29 (85.3%)<0.0015 (25%)18 (85.7%)<0.0015 (21.7%)21 (87.5%)<0.001
Location
 Right21 (40.4%)44 (44.9%)12 (33.3%)17 (50%)11 (55%)12 (57.1%)11 (47.8%)13 (54.2%)
 Left15 (28.8%)25 (25.5%)14 (38.9%)7 (20.6%)7 (35%)7 (33.3%)8 (34.8%)8 (33.3%)
 Rectum16 (30.8%)29 (29.6%)0.85310 (27.8%)10 (29.4%)0.3322 (10%)2 (9.5%)0.8834 (17.4%)3 (12.5%)0.980
Histology
 Hyper/inflammatory15 (15.3%)3 (8.8%)0 (0.0%)0 (0.0%)
 Tubular adenoma29 (29.6%)10 (29.4%)9 (42.9%)12 (50%)
 Tubulovillous adenoma28 (28.6%)7 (20.6%)7 (33.3%)7 (29.2%)
 Severe dysplasia26 (26.5%)14 (41.2%)5 (23.8%)5 (20.8%)
 Cancer52 (100.0%)36 (100.0%)20 (100.0%)23 (100.0%)

Abbreviations: IT: invasive tumors, NI: noninvasive tumors.