The Functional Rating Index: Twenty Years of Invalid Measurement

Conclusion. The original FRI and alternative forms all fail failed crucial psychometric tests and fail to accurately measure more than one latent construct. It is thus unfit as a pain, function, and disability assessment. Only reducing the number of Likert choices improved the test. Other back pain assessments should be used instead, and all surveys would benefit from periodic item responses to adjust to shifts in grammar and meaning. Level of Evidence: 3
Source: Spine - Category: Orthopaedics Tags: DIAGNOSTICS Source Type: research