Stepwise linear regression models for parameters associated with GFR.

RS, response surplus; BMI, body mass index; AC, antioxidant capacity; GFR, glomerular filtration rate. Only variables that significantly correlated with the dependent variable GFR in the bivariate analyses were tested in stepwise linear regression analyses. GFR was inversely associated with RS, creatinine, and age, and positively associated with BMI; all variables accounting for 74% of the variability in the GFR.Stepwise linear regression models for parameters associated with GFR.