#'Smoothing splines and KDE residuals pre-calculated from NHANES serum creatinine and age data by race/ethnicity and gender.
spline_serumcreatA data.table with 6 variables:
genderGender: Male or Female
rethRace/ethnicity: Mexican American, Other Hispanic, Non-Hispanic White, Non-Hispanic Black, Other
sc_splineA list of smooth.spline objects, each giving a smoothed relationship between log serum creatinine and age in months
sc_kdeA list of kde objects; each is a KDE of the distribution of residuals about the smoothing spline.