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Validity and reliability of the Generalized Anxiety Disorder-7 (GAD-7) among university students of Bangladesh

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  • Tahia Anan Dhira
  • Mahir A Rahman
  • Abdur Razzaque Sarker
  • Jeenat Mehareen

Abstract

This study investigated the reliability and factorial validity of General Anxiety Disorder-7 (GAD-7) in the context of university students in Bangladesh. The research aimed to assess whether the original one-dimensional model or a model containing both somatic and cognitive-emotional factors is appropriate. A repeated cross-sectional survey design based on convenience sampling was used to collect data from 677 university students. The factor structure of the GAD-7 was assessed by exploratory factor analysis (EFA) and confirmatory factor analysis (CFA), and its convergent validity was determined by investigating its correlations with Patient Health Questionnaire-9 (PHQ-9) and Patient Health Questionnaire Anxiety-Depression Scale (PHQ-ADS). Results showed excellent reliability of GAD-7 as measured by Cronbach’s α. CFA suggested that a modified one-factor model is appropriate for the sample. This model provided high values of comparative fit index (CFI), goodness of fit index (GFI), and Tucker Lewis Index (TLI), low value of standardized root mean square residual (SRMR) and a non-significant root mean square error of approximation (RMSEA). Correlation between GAD-7 and PHQ-9 was 0.751 and 0.934 between GAD-7 and PHQ-ADS. Overall, the study provided support for modified unidimensional structure for GAD-7 and showed high internal consistency along with good convergent validity.

Suggested Citation

  • Tahia Anan Dhira & Mahir A Rahman & Abdur Razzaque Sarker & Jeenat Mehareen, 2021. "Validity and reliability of the Generalized Anxiety Disorder-7 (GAD-7) among university students of Bangladesh," PLOS ONE, Public Library of Science, vol. 16(12), pages 1-16, December.
    • Handle: RePEc:plo:pone00:0261590
    DOI: 10.1371/journal.pone.0261590
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    References listed on IDEAS

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    1. Md Akhtarul Islam & Sutapa Dey Barna & Hasin Raihan & Md Nafiul Alam Khan & Md Tanvir Hossain, 2020. "Depression and anxiety among university students during the COVID-19 pandemic in Bangladesh: A web-based cross-sectional survey," PLOS ONE, Public Library of Science, vol. 15(8), pages 1-12, August.
    2. Ledyard Tucker & Charles Lewis, 1973. "A reliability coefficient for maximum likelihood factor analysis," Psychometrika, Springer;The Psychometric Society, vol. 38(1), pages 1-10, March.
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