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Research Article  |   January 2007
Psychometric Properties of the Loewenstein Occupational Therapy Cognitive Assessment–Second Edition in Taiwanese Persons With Schizophrenia
Author Affiliations
  • Chwen-Yng Su, PhD, OTR, is Associate Professor, School of Occupational Therapy, College of Health Science, Kaohsiung Medical University, Kaohsiung, Taiwan
  • Wan-Ling Chen, OTR, is Occupational Therapist, Department of Psychiatry, Kaohsiung Military General Hospital, Kaohsiung, Taiwan. At the time of this study, she was a graduate student in the Graduate Institute of Behavioral Sciences, Kaohsiung Medical University, Kaohsiung, Taiwan
  • Pei-Chun Tsai, OTR, Department of Psychiatry, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan
  • Chia-Yin Tsai, MS, OTR, is Occupational Therapist, Department of Rehabilitation Medicine, E-Da Hospital, Kaohsiung, Taiwan. At the time of this study, she was a graduate student in the Graduate Institute of Behavioral Sciences, Kaohsiung Medical University, Kaohsiung, Taiwan
  • Wei-Lieh Su, MS, OTR, is Lecturer, School of Occupational Therapy, College of Health Science, Kaohsiung Medical University, 100 Shi-Chuan 1st Road, San Ming District, Kaohsiung, Taiwan; cysu@cc.kmu.edu.tw
Article Information
Assessment Development and Testing / Mental Health / Original Articles
Research Article   |   January 2007
Psychometric Properties of the Loewenstein Occupational Therapy Cognitive Assessment–Second Edition in Taiwanese Persons With Schizophrenia
American Journal of Occupational Therapy, January/February 2007, Vol. 61, 108-118. doi:10.5014/ajot.61.1.108
American Journal of Occupational Therapy, January/February 2007, Vol. 61, 108-118. doi:10.5014/ajot.61.1.108
Abstract

OBJECTIVE. This study sought to determine the psychometric properties for the Loewenstein Occupational Therapy Cognitive Assessment–Second Edition (LOTCA–II) in a population of persons with schizophrenia.

METHOD. Sixty-four participants with schizophrenia were administered the LOTCA–II at baseline, and 43 of these were randomly selected to undertake four more standardized measures of cognitive and instrumental activities of daily living (IADL) functions to test convergent validity. One week later, 48 randomly selected participants from the total sample were readministered the LOTCA–II to determine test–retest reliability.

RESULTS. Substantial ceiling effects existed in 96% of LOTCA–II items. Cronbach’s alpha for all six sub-tests ranged from .20 to .91; the alpha for the global scale was .90. Intraclass correlation coefficients ranged from .49 to .89 for the subtests and .95 for the full LOTCA–II. Low to moderate correlations were found between LOTCA–II total score and scores on cognitive and IADL measures. No overall significant differences in subtest scores were found across participants differing in employment status.

CONCLUSION. LOTCA–II performance is best interpreted in the context of total score. Further revision of the test items is recommended for a more reliable and valid use of the LOTCA–II in persons with schizophrenia.