For adults: In general GFR > 60 is considered normal 15 < GFR < 60 is considered kidney disease GFR < 15 is considered kidney failure
get_gfr_category(age_years, age_months, gfr_est)
Vector of ages in years.
Vector of ages in months.
Vector of estimated GFR values in mL/min/1.73m^2.
Vector of GFR categories: 'Normal', 'Kidney Disease', 'Kidney Failure'.
These values can also be used for children 2 years old and greater (see PEDIATRICS IN REVIEW Vol. 29 No. 10 October 1, 2008 pp. 335-341 (doi: 10.1542/pir.29-10-335))
Ring, Caroline L., et al. "Identifying populations sensitive to environmental chemicals by simulating toxicokinetic variability." Environment International 106 (2017): 105-118.