Fig. 4From: Transcranial sonographic assessment of the third ventricle in neuro-ICU patients to detect hydrocephalus: a diagnostic reliability pilot studyLearning curves for V3 measurement by TCS. Plots represent the mean absolute difference between the V3 measurement by the 9 participating residents and the V3 measurement by an expert physician. Bars represent the standard errors of the mean. Full line represents right side, and dotted line the left side. Red line represents the 1-mm threshold which was the a priori defined learning objectiveBack to article page