01968nas a2200193   4500000000100000008004100001653002400042653001200066100001700078700001400095700001600109700001700125700001300142245008800155300003700243490000700280050000600287520148100293       2006                            d10aPeer Reviewed Paper10aChecked1 aRefshauge K.1 aHiller C.1 aHerbert Rob1 aKilbreath S.1 aBundy A.00aThe Cumberland Ankle Instability Tool: a report of validity and reliability testing  a1235-1241. [Impact Factor 1.814]0 v87  aN3 a<p>
OBJECTIVE: To test the Cumberland Ankle Instability Tool (CAIT), a 9-item 30-point scale, for measuring severity of functional ankle instability. DESIGN: Cross-sectional study. SETTING: General community. PARTICIPANTS: Volunteer sample of 236 subjects. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES: Concurrent validity by comparison with the Lower Extremity Functional Scale (LEFS) and a visual analog scale (VAS) of global perception of ankle instability by using the Spearman rho. Construct validity and internal reliability with Rasch analysis using goodness-of-fit statistics for items and subjects, separation of subjects, correlation of items to the total scale, and a Cronbach alpha equivalent. Discrimination score for functional ankle instability by maximizing the Youden index and tested for sensitivity and specificity. Test-retest reliability by intraclass correlation coefficient, model 2,1 (ICC(2,1)). RESULTS: There were significant correlations between the CAIT and LEFS (rho=.50, P&lt;.01) and VAS (rho=.76, P&lt;.01). Construct validity and internal reliability were acceptable (alpha=.83; point measure correlation for all items, &gt;0.5; item reliability index, .99). The threshold CAIT score was 27.5 (Youden index, 68.1); sensitivity was 82.9% and specificity was 74.7%. Test-retest reliability was excellent (ICC(2,1)=.96). CONCLUSIONS: CAIT is a simple, valid, and reliable tool to measure severity of functional ankle instability.
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