简介：AIM:Toidentifywhethertheforcepsestimationismoreusefulthanvisualestimationinthemeasurementofcolonpolypsize.METHODS:Werecordedcolonoscopyvideoclipsthatincludedscenesvisualizingthepolypandscenesusingopenbiopsyforcepsinassociationwiththepolyp,whichwereusedforanexam.Atotalof40endoscopistsfromtheBusanUlsanGyeongnamIntestinalStudyGroupSociety(BIGS)participatedinthisstudy.Participantswatched40pairsofvideoclipsofthescenesforvisualestimationandforcepsestimation,andwrotedowntheestimatedpolypsizeontheexampaper.Whenanalyzingtheresultsoftheexam,weassessedinterobserverdifferences,diagnosticaccuracy,anderrorrangeinthemeasurementofthepolypsize.RESULTS:Theoverallintra-classcorrelationcoefficients(ICC)ofinter-observeragreementforforcepsestimationandvisualestimationwere0.804(95%CI:0.731-0.873,P<0.001)and0.743(95%CI:0.656-0.828,P<0.001),respectively.TheICCsofeachgroupforforcepsestimationwerehigherthanthoseforvisualestimation(Beginnergroup,0.761vs0.693;Expertgroup,0.887vs0.840,respectively).Theoveralldiagnosticaccuracyforvisualestimationwas0.639andforforcepsestimationwas0.754(P<0.001).Inthebeginnergroupandtheexpertgroup,thediagnosticaccuracyfortheforcepsestimationwassignificantlyhigherthanthatofthevisualestimation(Beginnergroup,0.734vs0.613,P<0.001;Expertgroup,0.784vs0.680,P<0.001,respectively).Theoverallerrorrangeforvisualestimationandforcepsestimationwere1.48±1.18and1.20±1.10,respectively(P<0.001).Theerrorrangesofeachgroupforforcepsestimationweresignificantlysmallerthanthoseforvisualestimation(Beginnergroup,1.38±1.08vs1.68±1.30,P<0.001;Expertgroup,1.12±1.11vs1.42±1.11,P<0.001,respectively).CONCLUSION:Applicationoftheopenbiopsyforcepsmethodwhenmeasuringcolonpolypsizecouldhelpreduceinter-observerdifferencesanderrorrates.