Browsing by Author "Kumar, Mahendra"

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    Differential Item Functioning by HIV Status and Sexual Orientation of the Center for Epidemiological Studies– Depression Scale: An Item Response Theory Analysis
    (2021-1) Radusky, Pablo; Rodriguez, Violeta J.; Kumar, Mahendra; Jones, Deborah L.
    The Center for Epidemiological Studies-Depression Scale (CES-D) is the most widely used instrument to assess depressive symptoms in people living with HIV. However, its differential item functioning (DIF) by HIV status and sexual orientation has yet to be explored. This study examined DIF and measurement invariance of the CES-D using an item response theory (IRT) framework, and a more traditional factor analytic approach. Data from 841 HIV-infected and HIV-uninfected individuals, from Miami, Florida, were analyzed. Uniform DIF by HIV status was detected in Items 4, 12, and 16 from the Positive Affect factor. Nonuniform DIF was detected in Items 13 and 17. Uniform DIF by sexual orientation was detected in Items 2, 15, and 19, two of them from the Interpersonal factor. Nonuniform DIF was detected in Item 2. Using a factor analytic approach, the CES-D was invariant at the configural and metric levels by HIV and sexual orientation. These findings indicate that overall, however, using IRT, the magnitudes of DIF were negligible, the CED-D was somewhat invariant using factor analytic methods; the CES-D may be reliably used to compare by HIV status or sexual orientation.
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    Measurement invariance of the Childhood Trauma Questionnaire by genderpoverty leveland HIV status.
    (2017) Rodríguez, Violeta J.; Radusky, Pablo; Kumar, Mahendra; Nemeroff, Charles B.; Jones, Deborah
    ackground Assessing traumatic childhood events has important implications for treatment, due to increased high-risk behaviors, treatment nonadherence, and all-cause mortality. As such, it is important to ensure that screening tools used to measure traumatic childhood events are invariant across groups. The focus of this study was to examine measurement invariance across gender, poverty level, and HIV status in a commonly used childhood trauma screening tool, the Childhood Trauma Questionnaire – Short Form (CTQ-SF). Method Participants were N = 473 HIV-infected and uninfected men and women who completed a demographic questionnaire, the CTQ-SF, and underwent HIV testing. Results Participant age was an average of 36 years (SD = 9.40); 51% of participants were male, and 49% were female. Forty-three percent of participants were below the poverty level, and 36% were HIV-infected. Configural invariance was supported by gender, poverty level, and HIV status; scalar and strict invariance were not supported by gender, poverty level, and HIV status. Neither full nor partial metric invariance could be established by gender and income; however, the scale was invariant at the metric level by HIV status. Discussion Given the measurement bias identified in gender, poverty level, and HIV, practitioners and researchers must use caution when drawing conclusions regarding childhood trauma when using the CTQ-SF. Findings also suggest that statistical inferences and implications for practice based on comparisons of observed means will be distorted and may be misleading, and as such, established cutoffs may not apply similarly for these groups, suggesting an avenue for further research.