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Overall Patient Safety Score
To be eligible for a patient safety overall score, a hospital must have had outcomes in 11 of the 13 patient
safety indicators. Hospitals with 10 or fewer patient safety ratings were not eligible to receive an overall
patient safety score, but may have individual patient safety indicator ratings.
To determine the overall patient safety score by hospital, HealthGrades performed the following steps.
1.
HealthGrades statistically compared the actual rates of individual patient safety events to the
predicted rate to produce a score for each individual patient safety indicator that had a sufficient
volume at a hospital.
2.
The average of the resulting scores determined a hospital's ranking. Star ratings were then assigned as
follows:
Best (Top 10%)
As Expected (Middle 80%)
Poor (Bottom 10%)
Individual Patient Safety Indicator Rating
To determine a patient safety indicator score for each of the 13 PSIs for each hospital, HealthGrades
statistically compared the actual rate of individual patient safety event to the predicted rate. HealthGrades
then:
·
Displays if the PSI was Best, As Expected, or Poor.
·
Shows how many patients were affected per 1,000 patient discharges.
