Table 2 The top 9 rules by the rule-based model

Rule 1 (risk decreasing rule)

Rule 6 (risk decreasing rule)

Dispuniformrr ≤ 1 & CANCER_METS ≤ 0 & CANCER_LEUK ≤ 0 & CANCER_SOLID ≤ 0

DISPUNIFORMrr ≤ 6 & I10_NDX ≤ 7 & mortal_score ≤ 8 &DIAB_CX ≤ 0

Rule 2 (risk decreasing rule)

Rule 7 (risk decreasing rule)

pay1r > 2 & mortal_score ≤ 3

I10_NDX ≤ 17& RENLFL_SEV ≤ 0 & DISPUNIFORMrr ≤ 1 & CANCER_METS ≤ 0

Rule 3 (risk decreasing rule)

Rule 8 (risk decreasing rule)

HTN_CX ≤ 0 & mortal_score ≤ 0 & DRUG_ABUSE ≤ 0& H_CONTROL ≤ 2

I10_NDX ≤ 11 & mortal_score ≤ 4

Rule 4 (risk decreasing rule)

Rule 9 (risk decreasing rule)

DISPUNIFORMrr ≤ 6 & HTN_CX ≤ 0 & LOS ≤ 6 & I10_NPR ≤ 0

APRDRG_Severity ≤ 2 & LOS ≤ 6 & I10_NECAUSE ≤ 0

Rule 5 (risk increasing rule)

pay1r ≤ 2 & age ≤ 64