NPPB and transient ischemic attack: Finally, 10 non-zero characteristic variables were selected among 45 variables (Figures 2A,B), including age, mean artery pressure (MAP), CHF, previous AIS/TIA, cortical infarction, NIHSS score, low-density lipoprotein cholesterol (LDL-C), international normalized ratio (INR), CRP, and BNP (Table 2).