Figure 1. Decrease of postoperative pain during irradiation in the group with water-filtered infrared-A and visible light (wIRA(+VIS)) and in the control group with only visible light (VIS) .

(assessed with a visual analog scale; given as minimum, percentiles of 25, median, percentiles of 75, and maximum (box and whiskers graph with the box representing the interquartile range), adapted from [5]).

Remarkably during 230 single irradiations with wIRA(+VIS) the pain decreased without any exception, while pain remained unchanged in the control group (p<0.001, significant).