Fig. 1
From: Simulation-based assessment of upper abdominal ultrasound skills
The performance level of novice and expert participants during pretest contributed to establishment of a pass/fail-level by the contrasting groups method [13]. The pass/fail-level was determined as the intersection between standardized distributions of the novice and expert groups to ensure as few competent operators failing (false-negatives) and incompetent operators passing (false-positives)