Abstract
Knowledge about the transmission, prevention, and treatment of HIV remains a critical element in psychosocial models of HIV risk behavior and is commonly used as an outcome in HIV prevention interventions. However, most HIV knowledge questions have not undergone rigorous psychometric testing such as using item response theory. The current study used data from six studies of men who have sex with men (MSM; n = 3565) to (1) examine the item properties of HIV knowledge questions, (2) test for differential item functioning on commonly studied characteristics (i.e., age, race/ethnicity, and HIV risk behavior), (3) select items with the optimal item characteristics, and (4) leverage this combined dataset to examine the potential moderating effect of age on the relationship between condomless anal sex (CAS) and HIV knowledge. Findings indicated that existing questions tend to poorly differentiate those with higher levels of HIV knowledge, but items were relatively robust across diverse individuals. Furthermore, age moderated the relationship between CAS and HIV knowledge with older MSM having the strongest association. These findings suggest that additional items are required in order to capture a more nuanced understanding of HIV knowledge and that the association between CAS and HIV knowledge may vary by age.
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Notes
The TRACK study is the single study that did not fit into this categorization because only prospective measurement of CAS was collected. Accordingly, in order to avoid losing data, TRACK participants were coded as engaging in CAS if they reported that behavior in the 6 months after completing the HIV Knowledge questionnaire.
The relationships between the full scale (i.e., 38 items) and each of the substantive independent variables, including the interactions terms, is identical to that of the 17-item reduced scales.
References
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This work was supported by Grant R01DA035145 from the National Institute of Mental Health and National Institute of Drug Abuse.
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Patrick Janulis has no conflict of interest to declare. Michael E. Newcomb has no conflict of interest to declare. Patrick Sullivan has no conflict of interest to declare. Brian Mustanski has no conflict of interest to declare.
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All procedures performed in this study were in accordance with the ethical standards and approved by our institutional review board.
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Janulis, P., Newcomb, M.E., Sullivan, P. et al. Evaluating HIV Knowledge Questionnaires Among Men Who Have Sex with Men: A Multi-Study Item Response Theory Analysis. Arch Sex Behav 47, 107–119 (2018). https://doi.org/10.1007/s10508-016-0910-4
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DOI: https://doi.org/10.1007/s10508-016-0910-4