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Validation of Persian rapid estimate of adult literacy in dentistry
Social Determinants of Health Research Center, Qazvin University of Medical Sciences, Qazvin, Iran.
Department of Chiropractic, D'Youville College, Buffalo, NY, USA.
Population & Social Health Research Program, Griffith Health Institute, School of Dentistry and Oral Health, Gold Coast, QLD, Australia.
Jönköping University, School of Health and Welfare, HHJ, Dep. of Nursing Science. Jönköping University, School of Health and Welfare, HHJ. ADULT.
2016 (English)In: Journal of Investigative and Clinical Dentistry, ISSN 2041-1618, E-ISSN 2041-1626, Vol. 7, no 2, 198-206 p.Article in journal (Refereed) Published
Abstract [en]

Aim

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, < 0.01). In addition, IREALD-99 showed positive correlation with self-rated oral health status (rh = 0.31, < 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 (= 0.09), and only the very lowest income level was significantly different (< 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.

Place, publisher, year, edition, pages
2016. Vol. 7, no 2, 198-206 p.
Keyword [en]
oral health literacy; psychometric; rapid estimate of adult literacy in dentistry-99; rasch model; validity
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:hj:diva-25828DOI: 10.1111/jicd.12135ISI: 000387250300012PubMedID: 25329835Local ID: HHJADULTISOAI: oai:DiVA.org:hj-25828DiVA: diva2:786124
Available from: 2015-02-04 Created: 2015-02-04 Last updated: 2017-01-02Bibliographically approved

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