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The Lancashire Quality of Life Profile: modification and psychometric evaluation
C van Nieuwenhuizen1, A H Schene, M W Koeter
1Department of Psychotherapy and Research, TBS-kliniek De Kijvelanden, Forensic Psychiatric Hospital, PO Box 900, 3160 AC Rhoon, The Netherlands. chinie@kijvelanden.nl
Background:
Although widely used in Europe, the conceptual and psychometric qualities of the Lancashire Quality of Life Profile (LQoLP) have not been thoroughly examined. Four issues need attention: coverage, scale construction, systematic missing data, and psychometric properties.
Method:
Concept mapping was used to examine the coverage, and exploratory factor analysis to examine the empirical scale structure of the LQoLP. Data of 518 long-term patients from ten different mental health care settings were used. Modifications to the LQoLP were proposed on the basis of these findings, and its psychometric properties were tested. Thirty-one respondents participated in a test-retest reliability study (T1-T2: 2 weeks).
Results:
The modified LQoLP covers the quality of life-concept in a more comprehensive manner. Internal consistency, test-retest reliability and validity are good.
Conclusions:
The modified version of the LQoLP now covers ten domains, paying specific attention to patients' definition of quality of life (autonomy, coping, self-worth). Domains are now based on factor analysis. The problem of systematic missing data is solved. Psychometric properties are good. Because of moderate alphas, two domains need further investigation.