CREATE TABLE table_train_149 ("id" INT, "prostate_specific_antigen_psa" FLOAT, "c_peptide_level" FLOAT, "hemoglobin_a1c_hba1c" FLOAT, "fasting_serum_glucose" INT, "vitamin_d" INT, "NOUSE" FLOAT)

c _ peptide < 1 ng / ml;
SELECT * FROM table_train_149 WHERE c_peptide_level < 1
SELECT * FROM "table_train_149" WHERE "c_peptide_level" < 1