Univariate and multivariate analyses of the predictive values of aromatic amino acids for EGC.

aCoefficients for each factor were evaluated using univariate logistic regression;bTwo-sided Chi-squared test for coefficients obtained from univariate logisitic regression model;cAdjusted coefficients for each covariate were evaluated using multivariate logistic regression with adjustment for age, sex, Helicobacter pylori status, and protein concentration;dTwo-sided Chi-squared test for coefficients obtained from the multivariate logisitic regression model;eBecause there were collinearities between tyrosine phenylalanine and tryptophan (all R>0.8 ), we assessed the relationship between the levels of tyrosine, phenylalanine or tryptophan and the occurrence of EGC in three separate models, and the adjusted coefficients were estimated in each model.