Ratings of Treatment Options. demonstrates the physician estimated efficacy of different therapeutic options in the treatment of myofascial pain on a 6-fold scale (with 1 being "excellently effective" and 6 being "ineffective"). Ratings towards the lower ranks on the value axis indicate a higher estimated effectiveness. Data are expressed as mean ± SD. (*), (**) and (***) express the different levels of significance p < 0.05, 0.01 and 0.001. Between-group differences were examined with Kruskal-Wallis tests, using the Mann-Whitney U tests for post-hoc two-group comparisons. Stars are placed upon the confirmed group, respectively. TENS: transcutaneous electrical stimulation.