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A three-dimensional model for the tooth-loss patterns by multi-plane regression analysis.
Hisako Sasahara1, Hideo Sasahara, Makoto Kawamura
1Department of Preventive Dentistry, Faculty of Dentistry, Hiroshima University, Hiroshima, Japan. cioco@hiroshima-u.ac.jp
Statistics in Medicine
|September 5, 2002
Summary
Japanese adults experience distinct tooth-loss phases, with rapid loss in middle age. Prolonging the initial slow tooth-loss phase may significantly improve overall dental health.
Area of Science:
- Dental epidemiology
- Biostatistics
Background:
- Dental condition models aid epidemiological survey analysis.
- Longitudinal tooth-loss patterns require accurate modeling.
Purpose of the Study:
- To develop a simple, multi-plane regression model for Japanese adults' longitudinal tooth-loss patterns.
- Identify clear turning points in tooth-loss progression.
Main Methods:
- Utilized national dental survey data from 1957 onwards (ages 24-79).
- Applied a novel three-dimensional multi-plane regression analysis for three variables.
- Adapted intersecting straight lines regression for complex data.
Main Results:
- The developed model identified three distinct tooth-loss phases in Japanese adults.
- Phase 1 (younger adults) and Phase 3 (elders) showed slow tooth loss.
- Phase 2 (middle-aged adults) exhibited rapid tooth loss.
Conclusions:
- The three-phase model effectively represents Japanese adults' tooth-loss patterns.
- Prolonging the initial, slower tooth-loss phase (Phase 1) is key to enhancing dental health.
- This model offers insights for targeted public dental health interventions.