CREATE TABLE table_train_52 ("id" NUMBER, "pregnancy_or_lactation" BOOLEAN, "consent" BOOLEAN, "surgery" BOOLEAN, "hemodynamic_instability" BOOLEAN, "age" FLOAT, "NOUSE" FLOAT)

patients under 18 years
SELECT * FROM table_train_52 WHERE age < 18
SELECT * FROM "table_train_52" WHERE "age" < 18