文章基本信息

标题：Analysis of tooth decay data in Japan using asymmetric statistical models
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作者：Kouji Yamamoto ; Sadao Tomizawa
期刊名称：Open Access Medical Statistics
印刷版ISSN：2230-3251
电子版ISSN：2230-3251
出版年度：2012
卷号：2
页码：61-64
DOI：10.2147/OAMS.S35009
出版社：Dove Medical Press Ltd
摘要：Background: The aim of the present paper was to develop two new asymmetry probability models to analyze data for tooth decay from 363 women and 349 men aged 18–39 years who visited a dental clinic in Sapporo City, Japan, from 2001 to 2005. Methods: We analyzed the probability relationship between grade of upper and lower tooth decay for men and women using the two new models, and tested goodness-of-fit for the models. Results: The probability that a woman's (man's) grade of lower tooth decay is i ( i = 1,2) and her (his) grade of upper tooth decay is j (> i ), ( j = 2,3) is estimated to be at most 13.52 (10.23) times higher than the probability that the woman's (man's) grade of upper tooth decay is i and grade of lower tooth decay is j . Conclusion: From the data on tooth decay, decay of the upper teeth is worse than of the lower teeth in women and men, and the tendency becomes stronger as the numbers of decayed upper and lower teeth increase.
关键词：distance-proportional symmetry; asymmetry; square contingency table; teeth