Table 2.

Clustering results on the unstable angina dataset using IJM. 25 top-ranked treatment activities are listed to refer to clusters at level 2 in the hierarchies. Unique treatment activities of each cluster are marked with bold type.

Cluster	Cluster description
1	Antiplatelet treatment, Antianginal treatment, Routine blood test, Anticoagulation treatment, Ultrasonography examination, Lipid regulation, Biochemical examination, Discharge, Routine urine test, Admission, Routine stool test, Blood serum test, ECG examination, Coronary angiography, Blood typing, Calcium channel blockers, β-adrenergic receptor blockers, Anesthesia, Coagulation examination, Occult blood test, Angiotensin receptor antagonists, Radiographic examination, Stent implantation, Troponin T, PTCA
2	Antianginal treatment, Routine blood test, Biochemical examination, Ultrasonography examination, Hypnotic sedative and anxiolytic, Diuretics, Antiplatelet treatment, Glucose regulating treatment, ECG examination, Routine urine test, Calcium channel blockers, Routine stool test, Lipid regulation, Anticoagulation treatment, Discharge, Coagulation examination, Admission, Electrolyte regulating treatment, Analysis of blood plasma, Blood serum test, Blood sugar regulation, β-adrenergic receptor blockers, Occult blood test, Angiotensin receptor antagonists, Radiographic examination
3	Ultrasonography examination, CT examination, Antianginal treatment, Routine blood test, Biochemical examination, Routine urine test, Routine stool test, Admission, Lipid regulation, Discharge, Coagulation examination, Glucose regulating treatment, Calcium channel blockers, Blood serum test, Antiplatelet treatment, Occult blood test, Radiographic examination, Blood typing, ECG examination, Peripheral vasodilator, Anticoagulation treatment, Tumor markers checks, Analysis of blood plasma, Consultation, Transfer