Original articleReliability, validity, and responsiveness of the simple shoulder test: Psychometric properties by age and injury type
Section snippets
Methods
The clinical records used in this analysis were collected on patients between 1992 and 2004. A modified SST was administered routinely to all patients with shoulder complaints during their initial visit to the clinic and, in many instances, on subsequent visits to the clinic.
Results
The mean SST score was 6.86 (SD, 3.47). The mean scores for the age groups and injury type are listed in Table II. A 2-way analysis of variance was applied to determine whether SST scores differed by age group and injury type (Figure 1). There was a main effect of age group, after collapsing for injury type, as SST scores decreased with an increase in age (P = .011). There was not a main effect of injury type after collapsing across age group (P = .480). There was not a significant interaction
Discussion
This study provides additional information regarding the reliability, validity, and responsiveness of the SST. In this cohort of patients with shoulder injuries, there was strong test-retest reliability. The SST correlated well with the gold standard, the SF-12, for physical function and the ASES scale; fewer than 10% of patients had either the lowest possible score (floor effects) or the highest possible score (ceiling effects); and the SST performed well with regard to a priori hypotheses.
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