Psychometric properties of the Brief Illness Perception Questionnaire (Brief-IPQ) in Periodontal Diseases.

AIM to investigate the psychometric properties of the validated Portuguese version of the Brief Illness Perception Questionnaire (Brief-IPQ) in patients with gingivitis and periodontitis. MATERIAL & METHODS This study enrolled 571 patients with periodontal diseases (PDs) (67 gingivitis and 504 periodontitis cases), in a population-based epidemiologic survey conducted at the health centers in the South Lisbon Metropolitan Area. Brief-IPQ, a 9-item self-reported scale, reliability was evaluated using Cronbach's alpha. Confirmatory Factor Analysis (CFA) was used to construct validation. Multigroup analysis tested invariance across gender. RESULTS The Brief-IPQ showed acceptable reliability (α=0.80). CFA revealed good model fit (χ2 (16) = 41.236, GFI=0.982, CFI=0.985, RMSEA=0.053). All factors loaded similarly to the original Brief-IPQ scale, with the exception of the 'personal control' domain. Periodontal patients downgrade its illness and likely impact. The 'consequences' domain showed significant positive correlations with all factors, except 'treatment control' and 'understanding' domains. The 'concern' and 'emotional response' domains had the highest significant correlation. Multigroup analysis findings supported factor invariance across the sex groups. CONCLUSION The Brief-IPQ revealed acceptable reliability, construct factorial validity and invariance across gender. This short instrument may be used as an easily applicable and valuable tool to determine illness perception in patients with PDs. This article is protected by copyright. All rights reserved.

• Publication year

  2019

• Venue

  Journal of Clinical Periodontology

• Publication date

  2019-12-01

• Fields of study

  Medicine, Psychology

• Identifiers
  DOI 10.1111/jcpe.13186PMID 31446628
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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