SUMMARYThe Sit-to-Stand test (STST) involves comparing the change in a person's non-weight-bearing and weightbearing foot posture to quickly classify a person's overall foot mobility. Despite the simplicity of the test, its reliability and validity has not been established. The purpose of this study is to determine the intra-rater and inter-rater reliability of the STST as well as its validity. Ninety-seven subjects with a mean age of 25 years (±3.7) participated in the study. Each subject's foot posture from non-weight-bearing to weight-bearing was evaluated by two different raters. Each rater classifi ed each subject's change in foot posture as "Hypomobile", "Normal" or "Hypermobile". This same procedure was repeated approximately one week later without the raters being able to review what their original classifi cation for that subject had been. The subjects also had their foot mobility quantifi ed by measuring the height and width of their dorsal arch in both non-weight-bearing and weight-bearing. These quantitative measures of foot mobility were then classifi ed as "Hypomobile", "Normal", or "Hypermobile" using quartiles. A series of Cohen's Kappa coeffi cients were used to assess the amount of agreement between the visual classifi cations by each rater as well as the classifi cation between the observational and objective classifi cations. The between-day Kappa coeffi cients ranged from 0.613 to 0.719 and the inter-rater Kappa coeffi cients ranged from 0.473 to 0.531. The Kappa coeffi cients between the visual and quantitative classifi cations ranged from 0.281 to 0.436. The STST should therefore be used with caution because of its moderate between-rater reliability and validity.
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