Retrospective Cohort Study
Copyright ©The Author(s) 2022.
World J Gastrointest Endosc. Nov 16, 2022; 14(11): 672-683
Published online Nov 16, 2022. doi: 10.4253/wjge.v14.i11.672
Table 1 Comparison of key outcomes between eligible procedures performed by medical and surgical specialists

Medical, n = 716
Surgical, n = 551
P value
OR (95%CI)
Patient age, median (IQR)65 (58-73)64 (56-71)0.04-
Patient gender (male %)49.7 (n = 356)48.8 (n = 269)0.75-
Cancer detection rate (%)2.7 (n = 19)4.7 (n = 26)0.0520.55 (0.30-1.01)
CSPDR (%)46.6 (n = 325)35.6 (n = 187)< 0.0011.58 (1.25-1.99)
ADR (%)44 (n = 307)34 (n = 178)< 0.0011.53 (1.21-1.94)
SLDR (%)6.6 (n = 46)4.6 (n = 24)0.131.47 (0.89-2.45)
Table 2 Comparison of outcomes between eligible procedures performed with and without trainees

With trainees, n = 370
Without trainees, n = 968
P value
OR (95%CI)
Patient age, median (IQR)64 (57-72)64 (57-72)0.83-
Patient gender (male %)53.5 (n = 198)47.4 (n = 463)0.06-
Cancer detection rate (%)4.1 (n = 15)3.3 (n = 32)0.511.24 (0.66-2.31)
CSPDR (%)41.4 (n = 147)42.7 (n = 400)0.670.95 (0.74-1.21)
ADR (%)38.9 (n = 138)40.4 (n = 378)0.620.94 (0.73-1.21)
SLDR (%)4.8 (n = 17)6.3 (n = 59)0.300.74 (0.43-1.30)
Table 3 Comparison of outcomes between eligible procedures performed with medical and surgical trainees

Medical trainees, n = 370
Surgical trainees, n = 968
P value
OR (95%CI)
Patient age, median (IQR)59.5 (47-71)59 (48.75-69)0.30-
Patient gender (male %)49.7 (n = 166)52.3 (n = 206)0.49-
Cancer detection rate (%)2.3 (n = 5)3.3 (n = 10)0.490.68 (0.23-2.02)
CSPDR (%)38.2 (n = 81)32.5 (n = 94)0.191.28 (0.89-1.86)
ADR (%)36.3 (n = 77)29.1 (n = 84)0.091.39 (0.95-2.03)
SLDR (%)5.7 (n = 12)5.2 (n = 15)0.821.1 (0.5-2.39)
Table 4 Comparison of key outcomes between participating hospitals

Site 1 (n = 254)
Site 2 (n = 396)
Site 3 (n = 604)
Site 4 (n = 790)
Site 5 (n = 399)
P value
Overall (n = 2443)
Patient age, median (IQR)56 (46-66)61 (50-71)59.5 (49-70)61 (50-71)60 (50-71)< 0.00160 (50-70)
Patient gender (male %)56.7 (n = 144)45.7 (n = 181)48.0 (n = 290)48.4 (n = 382)50.4 (n = 201)0.0849.0 (n = 1197)
Proceduralist
Surgical (%)87.4 (n = 222)33.1 (n = 131)35.6 (n = 215)35.9 (n = 284)51.4 (n = 205)< 0.00143.3 (n = 1057)
Medical (%)12.6 (n = 32)66.9 (n = 265)64.1 (n = 387)50.5 (n = 399)48.4 (n = 193)< 0.00152.2 (n = 1276)
Trainee (%)59.4 (n = 151)38.9 (n = 154)8.1 (n = 49)28.1 (n = 222)38.1 (n = 152)< 0.00129.8 (n = 728)
Medical (%)0 (n = 0)61.7 (n = 95)91.8 (n = 45)39.2 (n = 87)70.4 (n = 107)-45.9 (n = 334)
Surgical (%)100 (n = 151)38.3 (n = 59)8.2 (n = 4)60.8 (n = 135)29.6 (n = 45)-54.1 (n = 394)
Inadequate bowel preparation (%)13.4 (n = 34)8.1 (n = 32)2.6 (n = 16)7.2 (n = 57)9.8 (n = 39)< 0.0017.3 (n = 178)
Indeterminate bowel preparation (%)0.0 (n = 0)2.8 (n = 11)1.5 (n = 9)4.3 (n = 34)22.1 (n = 88)< 0.0015.8 (n = 142)
Procedure completion (%)94.3 (n = 215)92.2 (n = 319)98.2 (n = 556)95.1 (n = 686)93.4 (n = 338)< 0.00195.1 (n = 2114)
Procedure completion (%) with adequate preparation98.0 (n = 195)94.5 (n = 294)99.2 (n = 537)98.0 (n = 627)96.3 (n = 233)0.9997.5 (n = 1886)
Eligible procedures1212163814621601340
Cancer detection (%)5.0 (n = 6)2.3 (n = 5)2.9 (n = 11)3.5 (n = 16)5.6 (n = 9)0.383.5 (n = 47)
CSPDR (%)30.4 (n = 35)40.8 (n = 86)48.6 (n = 180)42.6 (n = 190)41.1 (n = 62)0.0142.8 (n = 553)
ADR (%)27.8 (n = 32)39.3 (n = 83)45.7 (n = 169)39.5 (n = 176)37.7 (n = 57)0.0140.0 (n = 517)
SLDR (%)2.6 (n = 3)5.2 (n = 11)5.1 (n = 19)7.4 (n = 33)6.6 (n = 10)0.315.9 (n = 76)
Table 5 Multivariate regression analysis for detection rates of cancer, adenomas, and serrated lesions amongst eligible procedures

Coefficient
OR (95%CI)
P value
Cancer
Site0.111.11 (0.87-1.43)0.40
Patient age0.041.04 (1.02-1.07)< 0.001
Patient gender (male)-0.450.64 (0.36-1.14)0.13
Trainee (present)-0.120.89 (0.46-1.73)0.73
Proceduralist (medical)1-0.610.54 (0.30-0.97)0.04
Adenomas
Site-0.010.99 (0.90-1.09)0.84
Patient age0.041.04 (1.03-1.05)< 0.001
Patient gender (male)-0.650.53 (0.42-0.65)< 0.001
Trainee (present)0.221.24 (0.96-1.61)0.10
Proceduralist (medical)10.341.41 (1.13-1.76)0.002
Serrated lesions
Site0.081.08 (0.90-1.3)0.42
Patient age0.001.00 (0.99-1.02)0.57
Patient gender (male)0.411.51 (0.99-2.29)0.05
Trainee (present)0.261.29 (0.78-2.14)0.33
Proceduralist (medical)10.281.32 (0.87-2.02)0.19