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Korean Journal of Epidemiology 1992;14(2): 117-127.
A study on statistics used to test the tracking phenomenon of bloodpressure in childhood.
Chung Mo Nam, Soon Young Lee, Il Suh, Chong Yon Park
Abstract
This study was conducted to investigate the behavior of statistics, correlation analysis and 2X2 contingency table analysis, which were used to test the tracking phenomenon of blood pressure in childhood. Data were randomly generated by Blomqvist's model. The results of this study were as follows; 1. The correlation coefficients and probabilities of remaining in the upper quartile increased by the degree of tracking index θ, and decreased by the degree of within individual variation σe2. 2. The estimates of test statistics at θ=0.1, and σe2=82 were lower than those at θ= 0.0, and σe2=62 The results indicate that within individual variation must be considered to study the tracking phenomenon of blood pressure.


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