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ORIGINAL RESEARCH PAPER
Year : 2010  |  Volume : 23  |  Issue : 3  |  Page : 400

Evaluation of the Content Validity, Internal Consistency and Stability of an Instrument Designed to Assess the HIV/AIDS Knowledge of University Students


1 College of Health Sciences, Chicago State University, Chicago, Illinios, USA
2 Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa
3 Faculty of Community and Health Sciences, University of the Western Cape, Cape Town, South Africa
4 Faculty of Health Sciences, Hacettepe University, Ankara, Turkey

Correspondence Address:
J A Balogun
College of Health Sciences, BHS 607, 9501 South King Drive, Chicago State University, Chicago, IL, 60628
USA
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Source of Support: None, Conflict of Interest: None


PMID: 21290359

Objective: This study evaluated the content validity, internal consistency and stability of a questionnaire designed to assess the HIV/AIDS knowledge of young adults. Methods: The questionnaire was administered on two occasions, within two week intervals, to 219 university students in the USA (n=66), Turkey (n=53) and South Africa (n=100). The psychometric instrument contained demographic information questions and 45 knowledge questions regarding the HIV virus, ways of transmitting it, symptoms of HIV/AIDS infection and methods of prevention. Factor analysis was conducted to assess construct validity; Cronbach alphas and Pearson's product moment correlation (r) were calculated to evaluate internal consistency and stability, respectively. Results: The 45 knowledge questions produced a Kaiser-Meyer-Olkin (measure of sampling adequacy) value of 0.8133 and loaded on three factors with an overall Cronbach's alpha of 0.861. The r for the individual knowledge question was greater than 0.50 and the overall knowledge score was "almost perfect" (0.91; p<.001). For participating students from the USA, Turkey and South Africa, their r for the overall knowledge score was 0.80 (p<.001), 0.83 (p<.001) and 0.93 (p<.001), respectively. Conclusions: Our findings revealed that the instrument is highly stable and internally consistent. The availability of this instrument may enhance HIV intervention studies internationally.


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