Table 2 Classification rules of decision tree of the hospital charge on gastric cancer patients

A

with operation

B

without operation and chemotherapy, LOS< = 3.5 days

C

without operation and chemotherapy, 3.5<LOS< = 5.5 days, age< = 42.5 years

D

without operation and chemotherapy, LOS>5.5 days, age< = 42.5 years

E

without operation and chemotherapy, age>42.5 years, without radiotherapy

F

without operation and chemotherapy, age>42.5 years, with radiotherapy

G

without operation, with chemotherapy, LOS< = 8.5 days, age< = 59.5 years

H

without operation, with chemotherapy, LOS< = 8.5 days, 59.5 year<age< = 70.5 years

I

without operation, with chemotherapy, LOS< = 8.5 days, age>70.5 year

J

without operation, with chemotherapy, LOS>8.5 days