Fig. 4

Anxiety perception during vitreoretinal surgery under sub-Tenon anesthesia and prior to vitreoretinal surgery under general surgery on the visual analogue scale (VAS). Median is indicated with horizontal line the box. Bottom of the box represents 1st quartile, top 3rd quartile. Whiskers indicate 10th to 90th percentile. Outliers are indicated with staggered black circles and squares, respectively. *P = < 0.05