下顎第1大臼歯齲蝕経験のコウホート分析, -歯科疾患実態調査報告資料による-

概要

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The Survey of Dental Diseases, a nationwide survey of dental diseases in Japan, has been performed five times, i. e., every six years from 1952 to 1981, by the Ministry of Health and Welfare. Cohort analysis is a useful analytical method for such a set of time-series survey data. In these survey reports, the data are arranged by every five years of age, while the intervals of the survey have been every six years, so that it is difficult to apply standard cohort table analysis.<BR>In the present study, an isometric line map method and a Bayesian cohort analysis method are applied to the data on the lower first molar DMFT obtained from the survey reports. The isometric line map reveals that the cohorts born during World War II have a lower DMFT than the cohorts of the prewar and postwar periods. Using the Bayesian cohort model, age, period, and cohort effects can be separated, and the results clearly show a reduction of dental caries in the youngest cohort. The cohort born in 1962-66 have the highest cohort effect and the DMFT is reduced after this generation. The Bayesian cohort analysis also shows that the age effect on the DMFT in females increases gradually from adolescence to the twenties, whereas in males there is almost no change in that effect during that period of life.
有限責任中間法人日本口腔衛生学会の論文