2.1 Basic materials
Of the 372inpatints, the average age is(74.67±6.95)years old,average inpaint days are(11.96±8.5)days,average number of disease per person is (4.92±2.55)。Within them, the incidence rate of PIM among female patients is higher than that of male patients.The incidence rate of PIM among old adult patients ≥80 years old is higher than that of old adult patients aged 65 to 79. The incidence rate of PIM among patients with Inpatient days ≥10 is higher than that of the patients with inpatient days of 2-9 days. The incidence rate of PIM among patients with ≥4 disease is higher than that of the patients with 1 to 3 diseases. See Table 1 for details.