255878 Gauging Measurement Features of the Brief Symptoms Inventory 18 (BSI-18)

Tuesday, October 30, 2012

Jichuan Wang, PhD , School of Medicine, The George Washington University, Bowie, MD
In applications of the Brief Symptoms Inventory 18 (BSI-18), a well-known screening tool for psychiatric disorders, composite measures of the subscales are often used and scales reliabilities are examined using Cronbach's alphas. This study systematically examines the measurement features of the BSI-18. CFA models were used to gauge the factorial structure of the BSI-18 and estimate its item and scale reliabilities; and MIMIC model was used to test measurement invariance of the BSI-18 items. Using a sample of rural drug users in Ohio, our results show that the BSI-18 forms a hierarchic factorial structure with three first-order factors (i.e., somatization, depression, and anxiety) underlying a second-order factor (i.e., general severity). The CFA model-based item and scale reliabilities were calculated, and the total variance of each item explained by all the factors, and variances explained by the first- and second-order factors, respectively, were estimated using the Schmid-Leiman transformation. The MIMIC model results show that the only two of the 18 items display differential item functioning (DIF) for gender and education, indicating minor measurement non-invariance.

Learning Areas:
Biostatistics, economics
Public health or related research
Social and behavioral sciences

Learning Objectives:
1)Assess factorial structure of the BSI-18 in drug use population. 2)Demonstrate how to use Mplus to estimate second-order CFA model. 3)Demonstrate how to perform Schmid-Leiman transformation in higher-order CFA model 4)Demonstrate how to test differential item functioning (DIF).

Keywords: Biostatistics, Substance Abuse

Presenting author's disclosure statement:

Qualified on the content I am responsible for because: I am qualified on the content I am responsible for because I have been working in public health studies for over 20 years. I usually make two presentations in the Statistics Sessions of the APHA annual meetings each year in many of the past years.
Any relevant financial relationships? No

I agree to comply with the American Public Health Association Conflict of Interest and Commercial Support Guidelines, and to disclose to the participants any off-label or experimental uses of a commercial product or service discussed in my presentation.

Back to: 4178.0: Statistical Poster Session