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)

estimated glomerular filtration rate < 90 ml / min per 1.73 m2 of body surface area
SELECT * FROM table_train_210 WHERE estimated_glomerular_filtration_rate_egfr < 90
SELECT * FROM "table_train_210" WHERE "estimated_glomerular_filtration_rate_egfr" < 90