The formula to calculate the Inpatient Days Per 1000 (IDP1000) is:
\[ IDP1000 = \left(\frac{TID}{TP}\right) \times 1000 \]
Where:
Let's say the total inpatient days (TID) is 5000 and the total population (TP) is 100000. Using the formula:
\[ IDP1000 = \left(\frac{5000}{100000}\right) \times 1000 = 50 \]
So, the Inpatient Days Per 1000 (IDP1000) is 50.