Description

The General Health Questionnaire-28 (GHQ-28) is one of the most widely used and internationally validated psychometric screening instruments for assessing general mental health and psychological well-being. Developed by David P. Goldberg and Vivienne F. Hillier (1979) as a shortened version of the original General Health Questionnaire, the GHQ-28 is specifically designed to identify individuals experiencing current psychological distress and potential non-psychotic psychiatric disorders in both clinical and community settings.

The questionnaire consists of 28 self-report items, organized into four clinically meaningful subscales, each representing a major dimension of psychological functioning:

  • Somatic Symptoms, assessing physical complaints associated with psychological distress.
  • Anxiety and Insomnia, evaluating symptoms of anxiety, nervousness, tension, and sleep disturbances.
  • Social Dysfunction, measuring difficulties in performing everyday activities, occupational functioning, and interpersonal interactions.
  • Severe Depression, assessing depressive symptoms, hopelessness, suicidal ideation, and loss of interest in daily life.

Unlike diagnostic psychiatric interviews, the GHQ-28 focuses on identifying recent changes in psychological functioning compared with an individual’s usual state of health. This characteristic makes it particularly effective as an early screening instrument for detecting emotional distress before more severe psychiatric conditions become clinically apparent.

The GHQ-28 has been translated into numerous languages and extensively validated across different cultural settings, demonstrating excellent psychometric properties. It is widely applied in clinical psychology, psychiatry, primary healthcare, occupational medicine, behavioral medicine, nursing, public health, epidemiology, educational research, and community mental health programs.

Data Analysis and Use

The analysis of data obtained from the General Health Questionnaire-28 (GHQ-28) involves comprehensive psychometric and statistical procedures designed to evaluate the presence and severity of psychological distress across its four principal domains. Participant responses are converted into quantitative scores representing both overall psychological health and dimension-specific symptom severity.

Psychometric evaluation includes the assessment of internal consistency, typically measured using Cronbach’s alpha coefficient, which has consistently demonstrated excellent reliability across international validation studies. Test–retest reliability is commonly evaluated to examine the temporal stability of responses, while exploratory and confirmatory factor analyses verify the four-factor structure and construct validity of the questionnaire.

Additional psychometric analyses include item-total correlations, composite reliability, convergent validity, discriminant validity, criterion validity, predictive validity, receiver operating characteristic (ROC) analyses, and measurement invariance, ensuring accurate assessment across different demographic groups, clinical populations, and cultural contexts.

Statistical analyses frequently include descriptive statistics, correlation analyses, multiple regression models, logistic regression, mediation and moderation analyses, structural equation modeling (SEM), multilevel analyses, latent profile analysis, and longitudinal investigations to examine relationships between psychological distress and variables such as anxiety, depression, stress, resilience, coping strategies, quality of life, occupational functioning, social support, physical health, and treatment outcomes.

The GHQ-28 is extensively used in epidemiological surveys, primary care, psychiatric screening, occupational health services, university counseling centers, public health research, and intervention studies. The findings assist healthcare professionals in identifying individuals at increased risk for mental health disorders, evaluating intervention effectiveness, monitoring psychological change over time, and supporting evidence-based clinical decision-making.

Objective

The primary objective of the General Health Questionnaire-28 (GHQ-28) is to provide a reliable, valid, and efficient screening assessment of general mental health and psychological well-being. The questionnaire enables psychologists, psychiatrists, physicians, researchers, and other healthcare professionals to rapidly identify individuals experiencing symptoms of psychological distress who may require further clinical evaluation or psychological intervention.

The instrument facilitates the early detection of common mental health problems, including anxiety, depression, emotional distress, sleep disturbances, and impaired social functioning. It also supports the monitoring of mental health over time, allowing clinicians and researchers to evaluate treatment effectiveness, disease progression, recovery, and changes following therapeutic interventions.

The GHQ-28 is particularly valuable in psychology, psychiatry, primary healthcare, occupational medicine, public health, nursing, epidemiology, behavioral medicine, and educational research, where standardized assessment of psychological well-being contributes to prevention, early intervention, improved treatment outcomes, and enhanced quality of life.

Scoring

The General Health Questionnaire-28 (GHQ-28) consists of 28 self-report items, each answered using a 4-point response scale that reflects the participant’s recent psychological experiences.

Two standardized scoring methods are commonly employed:

  • Likert Scoring (0–1–2–3), which provides a continuous measure of psychological distress and is widely used in research and outcome evaluation.
  • Binary GHQ Scoring (0–0–1–1), primarily used for screening purposes to identify probable psychiatric cases.

Individual item scores are summed to produce both subscale scores and an overall GHQ-28 Total Score. The four subscales may be interpreted independently to provide a detailed profile of psychological functioning:

  • Somatic Symptoms
  • Anxiety and Insomnia
  • Social Dysfunction
  • Severe Depression

Higher scores indicate greater psychological distress, poorer mental health, and an increased likelihood of clinically significant emotional difficulties, whereas lower scores reflect better psychological well-being and healthier psychosocial functioning.

The interpretation of GHQ-28 results should be based on validated normative data and supported by comprehensive psychometric evaluation, including Cronbach’s alpha coefficients, construct validity, criterion validity, sensitivity, specificity, predictive validity, and cross-cultural validation, ensuring accurate assessment across diverse clinical and non-clinical populations.

References

Goldberg, D. P., & Hillier, V. F. (1979). A Scaled Version of the General Health Questionnaire. Psychological Medicine, 9(1), 139–145.

Goldberg, D. P., & Williams, P. (1988). A User’s Guide to the General Health Questionnaire. Windsor: NFER-Nelson.

Karadimos, A. (2005). Psychometric Evaluation of the GHQ-28 in the Greek Population. Validation and Reliability Study.

Sterling, M. (2011). General Health Questionnaire – 28 (GHQ-28). Journal of Physiotherapy, 57(4), 259.

Tait, R. J., French, D. J., & Hulse, G. K. (2003). Validity and Psychometric Properties of the General Health Questionnaire-12 in Young Australian Adolescents. Australian and New Zealand Journal of Psychiatry, 37(3), 374–381.