Measuring mental health outcomes in primary care: the psychometric properties of a new patient-generated outcome measure, 'PSYCHLOPS' ('psychological outcome profiles')

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Abstract:

Background Patient-generated outcome measures are rarely used in evaluating talking therapies in primary care but in other contexts they show high sensitivity to change. We have devised a novel patient-generated measure called 'PSYCHLOPS' ('Psychological Outcome Profiles'). This paper describes the psychometric properties of PSYCHLOPS.

Method Standardised responses to PSYCHLOPS, pre- and post-therapy, were compared with responses to an established measure, CORE-OM.

Results Data were obtained from 110 patients. The effect size, a measure of sensitivity to change, was −1.53 for PSYCHLOPS and −1.06 for COREOM (t = 5.10, P < 0.001). Pre-therapy alpha scores were 0.79 and 0.94, respectively. Change scores of both instruments correlated strongly (Spearman's rho = 0.61; P < 0.001). Detailed validity testing is reported.

Conclusion PSYCHLOPS is a sensitive measure of change after therapy. Alpha scores suggest satisfactory internal reliability. Evidence of convergent, concurrent and construct validity has been obtained. Further work is required to establish test–retest reliability.

Keywords: PATIENT-GENERATED OUTCOME MEASURES; PSYCHOMETRICS; VALIDATION STUDY

Document Type: Research Article

Publication date: December 1, 2005

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