The MAR Method Versus the Visual Estimation Method in Predicting External Blood Loss

"The study was conducted in three isolated stations. Two faculty researchers designed the scenarios, while three others supervised training. Medical student investigators recorded blood loss estimates and estimation times.~Before the study, investigators received 20-minute training. Participants and investigators were blinded to actual blood volumes. Group 1 and Group 2 attended a 10-minute briefing, including consent and study introduction.~The study had two phases. In Phase 1, Group 1 used the Visual Estimation (VE) method, while Group 2 received a 2-minute MAR method training before making estimations. In Phase 2, Group 1 was trained in the MAR method and repeated estimations.A data form recorded demographics, blood loss estimates, and estimation times.~Group 1's VE data and Group 2's MAR data were compared between groups, while Group 1's VE and MAR data were analyzed within the group. Combined MAR data from both groups were used to assess the impact of gender, height, and weight."