Fig. 4From: Development and validation of an objective assessment scale for chest tube insertion under ‘direct’ and ‘indirect’ ratingVisualization of the results for interrater reliability between the two ‘indirect’ ratings. In particular, data regarding interrater reliability is visualized using bland-altman plots. Here, the x-axis represents the average of given points, whereas the y-axis represents the difference between scores. SD = standard deviationBack to article page