Back to Journals » Open Access Medical Statistics » Volume 2

Analysis of tooth decay data in Japan using asymmetric statistical models

Authors Yamamoto K, Tomizawa S

Received 14 June 2012

Accepted for publication 12 September 2012

Published 19 November 2012 Volume 2012:2 Pages 61—64

DOI https://doi.org/10.2147/OAMS.S35009

Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 3

Kouji Yamamoto,1 Sadao Tomizawa2

1Department of Medical Innovation, Osaka University Hospital, Osaka, 2Department of Information Sciences, Faculty of Science and Technology, Tokyo University of Science, Noda City, Chiba, Japan

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.

Keywords: distance-proportional symmetry, asymmetry, square contingency table, teeth

Creative Commons License This work is published and licensed by Dove Medical Press Limited. The full terms of this license are available at https://www.dovepress.com/terms.php and incorporate the Creative Commons Attribution - Non Commercial (unported, v3.0) License. By accessing the work you hereby accept the Terms. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed. For permission for commercial use of this work, please see paragraphs 4.2 and 5 of our Terms.

Download Article [PDF] 

 

Readers of this article also read:

Simultaneous growth of two cancer cell lines demonstrates variability in growth rates

Hamon A, Tosolini M, Ycart B, Pont F, Fournie JJ

Open Access Medical Statistics 2014, 4:29-37

Published Date: 28 November 2014

Contraceptive implants: current perspectives

Rowlands S, Searle S

Open Access Journal of Contraception 2014, 5:73-84

Published Date: 23 September 2014

Body mass index and the risk of prostate cancer

McGee DL, Crespo CJ

Open Access Medical Statistics 2012, 2:53-60

Published Date: 27 September 2012

Cancer as an immune-mediated disease

Shurin MR

ImmunoTargets and Therapy 2012, 1:1-6

Published Date: 14 June 2012

Assessing the variability of the attributable causes of death

Fu WJ, Wu T, Wang Y, Meng H, Huang J

Open Access Medical Statistics 2011, 1:37-43

Published Date: 23 September 2011

Optimal management of familial hypercholesterolemia: treatment and management strategies

Mohammad Hassan Nemati, Behrooz Astaneh

Vascular Health and Risk Management 2010, 6:1079-1088

Published Date: 3 December 2010

Contraceptive practices in Nigeria: Literature review and recommendation for future policy decisions

Emmanuel Monjok, Andrea Smesny, John E Ekabua, et al

Open Access Journal of Contraception 2010, 1:9-22

Published Date: 5 May 2010