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Schizophrenia, a complex psychiatric disorder, has been historically misunderstood. Early psychological theories attributed its origins to childhood trauma and unresponsive parenting. However, contemporary research largely rejects these notions, favoring the vulnerability-stress hypothesis. This model proposes that individuals with a genetic predisposition to schizophrenia may develop the disorder following exposure to significant environmental stressors. Notably, studies on high-risk...
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A Rasch Analysis between Schizophrenic Patients and the General Population.

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The General Oral Health Assessment Index Questionnaire (GOHAI) shows differential item functioning (DIF) across age and mental health status. GOHAI scores need adjustment for accurate comparisons in diverse populations.

Keywords:
Differential item functioningOral Health related Quality of LifeRasch analysisoral healthschizophrenia

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Area of Science:

  • Psychometrics
  • Oral Health Assessment
  • Mental Health Research

Background:

  • The General Oral Health Assessment Index Questionnaire (GOHAI) is widely used.
  • Assessing oral health's impact on quality of life is crucial.
  • Understanding potential biases in health assessment tools is important.

Purpose of the Study:

  • To investigate differential item functioning (DIF) in GOHAI items.
  • To examine DIF based on demographic factors (gender, age) and mental health status (schizophrenia).
  • To apply Rasch analysis for psychometric evaluation of the GOHAI.

Main Methods:

  • Cross-sectional study utilizing aggregated baseline data.
  • Validation studies of GOHAI in the French general population (GP) and persons with schizophrenia (PWS).
  • Rasch analysis with the Partial Credit Model to estimate DIF.

Main Results:

  • Five of 12 GOHAI items exhibited significant DIF.
  • DIF was observed for schizophrenia status (3 items), age (3 items), and gender (1 item).
  • Age significantly impacted the latent variable, showing a small to medium effect size.

Conclusions:

  • GOHAI scores may require adjustment for DIF to ensure comparability across different demographic and health groups.
  • Further research is needed to explore DIF in other oral health assessment tools and mental illness populations.