Fig. 1

Mean rating of the evaluation in series 1 and series 2. Presented as mean ± std. dev. for the overall score and the main categories. Each item was rated on a 5-point Likert scale (from 5 = excellent to 1 = poor). In light grey ‘point of measurement 1’; in dark grey ‘point of measurement 2’; * p < 0.05; ** p < 0.01; ns p > 0.05