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Journal of Dental Research, Vol 68, 1777-1780, Copyright © 1989 by International & American Associations for Dental Research Online Journals

ARTICLES

Cohort effects in the prevalence of caries in child populations in Tanzania

J. E. Frencken, M. A. Van 't Hof, G. J. Truin, B. S. Lembariti and K. G. Konig
Department of Cariology, University of Nijmegen, The Netherlands.

In 1984, a four-year mixed-longitudinal study of oral health was begun in Morogoro Town and Morogoro District, Tanzania. Its main goal was to detect a possible upward trend in prevalence of caries in child cohorts in this developing country. The sample consisted of 722 seven- to nine-year-olds in 1984, 833 seven- to 11-year-olds in 1986, and 989 seven- to 13-year-olds in 1988. Mixed-longitudinal studies provide the opportunity for application of the Age-Period-Cohort analysis. On the basis of external information, either age and/or cohort and/or period effects can thus be isolated. Apart from significant age and period effects, a cohort effect was found, indicating that the prevalence of caries has decreased in these child populations between 1984 and 1988.




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