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Psychol Assess. 2016 Mar;28(3):263-278. doi: 10.1037/pas0000174. Epub 2015 Jun 15.

Psychometrics of the Personal Questionnaire: A client-generated outcome measure.

Author information

1
School of Psychological Science and Health, University of Strathclyde.
2
Dialectical Behaviour Therapy Centre of Vancouver.
3
Centro de Investigação em Educação e Psicologia, Universidade de Évora.
4
School of Nursing, Midwifery and Social Work, University of Queensland.
5
Centro de Investigação e Intervenção Social, ISCTE - Instituto Universitário de Lisboa.
6
Portuguese Association of Family and Community Therapy.

Abstract

We present a range of evidence for the reliability and validity of data generated by the Personal Questionnaire (PQ), a client-generated individualized outcome measure, using 5 data sets from 3 countries. Overall pretherapy mean internal consistency (alpha) across clients was .80, and within-client alphas averaged .77; clients typically had 1 or 2 items that did not vary with the other items. Analyses of temporal structure indicated high levels of between-clients variance (58%), moderate pretherapy test-retest correlation (r = .57), and high session-to-session Lag-1 autocorrelation (.82). Scores on the PQ provided clear evidence of convergence with a range of outcome measures (within-client r = .41). Mean pre-post effects were large (d = 1.25). The results support a revised caseness cutoff of 3.25 and a reliable change index interval of 1.67. We conclude that PQ data meet criteria for evidence-based, norm-referenced measurement of client psychological distress for supporting psychotherapy practice and research.

PMID:
26075406
DOI:
10.1037/pas0000174
[Indexed for MEDLINE]

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