科研之友
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摘要
The aim of the present paper was to improve and expand research with a larger number of children from various European countries and to provide a common formula useful for all these countries. Orthopantomographs taken from 2,652 European Caucasian children (1,382 boys, 1,270 girls) aged between 4 and 16 years were analyzed. The children came from Croatia, Germany, Kosovo, Italy, Slovenia, Spain, and the UK. Following the pilot study, subjects' age was modeled as a function of gender (g), morphological variables (predictors) x 5(second premolar), s (sum of normalized open apices) N (0), and the first-order interaction between s and N (0). The results showed that all these variables contributed significantly to the fit, so that all were included in the regression model, yielding the following linear regression formula: Age= 8.387+ 0.282 g- 1.692 x 5+ 0.835 N-0- 0.116 s- 0.139 s x N-0, where g is a variable, 1 for males and 0 for females. The equation explained 86.1% ( R-2= 0.861) of total deviance. The median of the residuals (= observed age minus predicted age) was - 0.114 years, with ( RefB. 2) interquartile range= 1.22 years.
- 出版日期2007-11
- 单位河北医科大学
