ผู้ป่วยที่มีค่าครีเอตินีนเคลียร์ < 50 มล./นาทีไม่จำเป็นต้องใช้ทุกตาราง
patients with creatinine clearance < 50 ml / min,It is not neccessary to use all the tables.
 table_test_18:  "id" [ int]  "bleeding" [ int]  "dialysis" [ bool]  "hct" [ int]  "hepatic_disease" [ bool]  "anaemia" [ bool]  "creatinine_clearance_cl" [ float]  "polycytaemia" [ bool]  "thrombocytopenia" [ float]  "kidney_disease" [ bool]  "body_mass_index_bmi" [ float]  "glycosylated_hemoglobin" [ float]  "NOUSE" [ float] 
SELECT * FROM table_test_18 WHERE creatinine_clearance_cl < 50