title: Validation of Persian rapid estimate of adult literacy in dentistry.
abstract: OBJECTIVE
  The aim of the present study was to establish the psychometric properties of the Rapid Estimate of adult Literacy in Dentistry-99 (REALD-99) in the Persian language for use in an Iranian population (IREALD-99).
  
  
  METHODS
  A total of 421 participants with a mean age of 28 years (59% male) were included in the study. Participants included those who were 18 years or older and those residing in Quazvin (a city close to Tehran), Iran. A forward-backward translation process was used for the IREALD-99. The Test of Functional Health Literacy in Dentistry (TOFHLiD) was also administrated. The validity of the IREALD-99 was investigated by comparing the IREALD-99 across the categories of education and income levels. To further investigate, the correlation of IREALD-99 with TOFHLiD was computed. A principal component analysis (PCA) was performed on the data to assess unidimensionality and strong first factor. The Rasch mathematical model was used to evaluate the contribution of each item to the overall measure, and whether the data were invariant to differences in sex. Reliability was estimated with Cronbach's α and test-retest correlation.
  
  
  RESULTS
  Cronbach's alpha for the IREALD-99 was 0.98, indicating strong internal consistency. The test-retest correlation was 0.97. IREALD-99 scores differed by education levels. IREALD-99 scores were positively related to TOFHLiD scores (rh = 0.72, P < 0.01). In addition, IREALD-99 showed positive correlation with self-rated oral health status (rh = 0.31, P < 0.01) as evidence of convergent validity. The PCA indicated a strong first component, five times the strength of the second component and nine times the third. The empirical data were a close fit with the Rasch mathematical model. There was not a significant difference in scores with respect to income level (P = 0.09), and only the very lowest income level was significantly different (P < 0.01).
  
  
  CONCLUSIONS
  The IREALD-99 exhibited excellent reliability on repeated administrations, as well as internal consistency. The IREALD-99 can be used for the basic screening of oral health literacy among the Iranian population.
authors.affiliation: Social Determinants of Health Research Center, Qazvin University of Medical Sciences, Qazvin, Iran.|Department of Public Health, Qazvin University of Medical Sciences, Qazvin, Iran.
authors.forename: Amir H
authors.initials: AH
authors.lastname: Pakpour
authors.affiliation: Department of Chiropractic, D'Youville College, Buffalo, NY, USA.
authors.forename: Douglas M
authors.initials: DM
authors.lastname: Lawson
authors.affiliation: Population & Social Health Research Program, Griffith Health Institute, School of Dentistry and Oral Health, Gold Coast, QLD, Australia.
authors.forename: Santosh K
authors.initials: SK
authors.lastname: Tadakamadla
authors.affiliation: School of Health Sciences, Jönköping University, Jönköping, Sweden.
authors.forename: Bengt
authors.initials: B
authors.lastname: Fridlund
mesh_terms: D000328:Adult; D003813:Dentistry; D005260:Female; D007722:Health Knowledge, Attitudes, Practice; D057220:Health Literacy; D006801:Humans; D007492:Iran; D008297:Male; D011594:Psychometrics; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires
keywords: oral health literacy; psychometric; rapid estimate of adult literacy in dentistry-99; rasch model; validity