SELECT * FROM table_train_210 WHERE estimated_glomerular_filtration_rate_egfr < 90
estimated glomerular filtration rate < 90 ml / min per 1.73 m2 of body surface area
CREATE TABLE table_train_210 (
    "id" int,
    "serum_potassium" float,
    "serum_calcium" float,
    "estimated_glomerular_filtration_rate_egfr" int,
    "body_mass_index_bmi" float,
    "age" float,
    "NOUSE" float
)