Subacromial impingement syndrome (SIS) refers to shoulder pain resulting from a particular impingement of the rotator cuff tendon. The article “Evaluation of the Effectiveness of Three Physiotheraputic Treatments for SIS” (Physiotherapy 2016: 57–63) reports a study in which 99 SIS sufferers were randomly assigned to receive one of three treatments across 20 sessions. The Constant–Murley score (CMS), standard measure of shoulder functionality and pain, was administered to each subject before the experiment and again one month post-treatment. The accompanying table summarizes the change in CMS (higher numbers are better) for the subjects.

Test to see whether the true mean increase in CMS differs across the three different treatments, at the α = .05 significance level.

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Treatment Ultrasound Phonophoresis Iontophoresis n 32 33 34 Mean 5.1 6.4 6.5 SD 10.3 9.3 18.1