Reliability of Ratings on the Glasgow Outcome Scales from In-person and Telephone Structured Interviews

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Abstract

Objective

To determine test-retest reliability and interrater reliability for structured interviews for the Glasgow Outcome Scale (GOS) using in-person and telephone contact.

Methods

Study 1: Thirty head-injured patients were interviewed face-to-face and then reinterviewed by telephone a few days later by the same rater. Study 2: Fifty-six head-injured patients were interviewed by telephone and then face-to-face interviews were carried out by a different person up to 1 month later. Agreement between ratings on the GOS and the extended GOS (GOSE) in each of the studies was assessed using the κ statistic weighted with quadratic weights.

Results

Values of κw for the test-retest reliability study were .92 for both GOS and GOSE, and for interrater reliability study were .85 for the GOS and .84 for the GOSE.

Conclusions

The findings indicate good test-retest and interrater reliability for the structured interviews. In most circumstances a structured interview over the telephone can provide a reliable assessment of the GOS, and can safely be substituted for in person contact.

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