Psychometric properties of the 7-item Generalized Anxiety Disorder scale in antepartum women from Ghana and Côte d'Ivoire

Dana Barthel, Claus Barkmann, Stephan Ehrhardt, Carola Bindt

Research output: Contribution to journalArticlepeer-review

Abstract

Background To explore the psychometric properties of the 7-item Generalized Anxiety Disorder scale (GAD-7) in West African pregnant women. Methods In a cross-sectional study, the GAD-7, the PHQ-9 (depression module of the Patient Health Questionnaire) and the WHO-DAS II (12-item World Health Organization Disability Scale) were administered to n=647 Ivorian and n=395 Ghanaian antepartum women with low-risk pregnancies (third trimester; gestational age range: 28-40 weeks) in 2010-2011. Statistical analyses combined classical test theory (CTT) and item response theory (IRT). Results Cronbachs α was close to acceptable (α=.69 in Côte d'Ivoire; α=.67 in Ghana). Construct validity was demonstrated by correlations between the GAD-7 and both the PHQ-9 and the WHO-DAS II. Results regarding factorial validity were ambiguous: confirmatory and exploratory factor analyses indicated that the data fit the unidimensionality assumption; however, the explained variance was low. IRT methods suggested excellent item infit and outfit measures. Yet, residual principal component analyses showed a lack of unidimensionality. Rasch analyses revealed that the response options were not used as intended. Item-person-fit was not optimal since the items did not discriminate well on the range of the latent construct where most of the women drawn from the general population were located. Limitations Both samples were somewhat homogenous regarding gestational age and urban residence; test-retest reliability was not investigated. Conclusion The GAD-7 met the requirements of CTT. However, applying the stricter criteria of IRT suggested areas for potential improvements. Cross-cultural adaption and a dichotomized response format might ameliorate the GAD-7 for the use in sub-Saharan countries.

Original languageEnglish (US)
Pages (from-to)203-211
Number of pages9
JournalJournal of Affective Disorders
Volume169
DOIs
StatePublished - Dec 1 2014

Keywords

  • Africa
  • Antepartum
  • Anxiety
  • Disorder
  • GAD-7
  • Generalized
  • Psychometrics

ASJC Scopus subject areas

  • Clinical Psychology
  • Psychiatry and Mental health

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