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Validity and reliability of sincerity test for dynamic trunk motions
S A Ferguson1, S Gallagher, W S Marras
1Biodynamics Laboratory, The Ohio State University, Columbus, OH, USA. ferguson.4@osu.edu
Disability and Rehabilitation
|March 8, 2003
Summary
This study validates a new technique for assessing sincerity of effort in dynamic trunk motion. The method accurately identifies sincere effort and demonstrates high reliability for clinical use.
Area of Science:
- Biomechanics
- Physical Therapy
- Occupational Health
Background:
- Assessing sincerity of effort is crucial in functional evaluations.
- Marras et al. proposed a technique for dynamic trunk motion, but its validity and reliability were unevaluated.
Purpose of the Study:
- To determine if a sincerity of effort measure accurately identifies sincere effort in a blinded randomized controlled trial.
- To quantify the inter-rater and test-retest reliability of the technique.
Main Methods:
- A two-phase study was conducted.
- Phase 1: A blinded randomized controlled trial where participants were assigned to sincere or insincere performance conditions.
- Phase 2: Two examiners evaluated each participant twice to assess inter-rater and test-retest reliability.
Main Results:
- The blinded phase showed 100% specificity and 90% sensitivity in identifying sincere and insincere effort.
- No significant differences in sincere effort probability were found between raters or testing sessions.
Conclusions:
- A reliable performance criterion for identifying sincere vs. insincere effort during functional evaluations was established.
- The technique demonstrates good predictive validity and is reliable for assessing sincerity of effort.