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Questionnaire techniques in assessing acne handicap: reliability and validity study

M S Salek1, G K Khan, A Y Finlay

  • 1Medicines Research Unit, University of Wales College of Cardiff.

Quality of Life Research : an International Journal of Quality of Life Aspects of Treatment, Care and Rehabilitation
|February 1, 1996
PubMed
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This study found the Cardiff Acne Disability Index (CADI) and Acne Disability Index (ADI) are reliable and valid for measuring acne

Area of Science:

  • Dermatology
  • Health Outcomes Research
  • Psychometrics

Background:

  • Acne vulgaris significantly impacts patients' quality of life.
  • Validated instruments are crucial for assessing the psychosocial burden of acne.
  • Existing measures may not fully capture the disability associated with acne.

Purpose of the Study:

  • To evaluate the reliability and validity of the Cardiff Acne Disability Index (CADI) and Acne Disability Index (ADI).
  • To compare these acne-specific measures with the general health status instrument, the United Kingdom Sickness Impact Profile (UKSIP).
  • To establish the psychometric properties of CADI, ADI, and UKSIP in acne patients.

Main Methods:

  • Test-retest reliability assessed over 10 days in 70 acne patients for UKSIP, ADI, and CADI.

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  • Internal consistency evaluated for all three instruments.
  • Cross-sectional comparison of UKSIP, ADI, and CADI scores between 100 acne patients and 50 controls.
  • Correlation analysis with clinical acne severity scores.

    • Main Results:

    • High test-retest reliability (correlation coefficients > 0.96) and internal consistency for UKSIP, ADI, and CADI.
    • Acne patients reported significantly higher scores on UKSIP, ADI, and CADI compared to controls.
    • The CADI demonstrated correlation with clinical acne severity, unlike ADI and UKSIP.
    • UKSIP scores correlated with CADI scores, but not ADI scores.

    Conclusions:

    • The UKSIP, ADI, and CADI exhibit strong reliability and validity for assessing acne-related disability.
    • CADI shows promise as a valid measure correlating with clinical acne severity.
    • These instruments provide valuable tools for quantifying the impact of acne on patients' lives.