How To Calculate PSI 90

PSI 90 Formula:

\[ PSI\ 90 = \frac{\sum (w_i \times \frac{observed_i}{expected_i})}{\sum w_i} \]

Weight for Indicator 1 (w₁):

unitless

Observed Rate for Indicator 1:

rate

Expected Rate for Indicator 1:

rate

Weight for Indicator 2 (w₂):

unitless

Observed Rate for Indicator 2:

rate

Expected Rate for Indicator 2:

rate

PSI 90 Composite Score:

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1. What Is PSI 90?

PSI 90 is a composite patient safety indicator that measures hospital-level patient safety performance. It combines multiple individual PSIs into a single weighted score to provide an overall assessment of patient safety.

2. How Does The Calculator Work?

The calculator uses the PSI 90 formula:

\[ PSI\ 90 = \frac{\sum (w_i \times \frac{observed_i}{expected_i})}{\sum w_i} \]

Where:

\( w_i \) — Weight for indicator i (unitless)
\( observed_i \) — Observed rate for indicator i
\( expected_i \) — Expected rate for indicator i
\( \sum \) — Summation across all component indicators

Explanation: The formula calculates a weighted average of the ratio of observed to expected rates for each component patient safety indicator.

3. Importance Of PSI 90 Calculation

Details: PSI 90 is crucial for hospital quality assessment, benchmarking patient safety performance, identifying areas for improvement, and meeting regulatory requirements for quality reporting.

4. Using The Calculator

Tips: Enter weights and rates for at least two component indicators. Weights are unitless values that reflect the relative importance of each indicator. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What does PSI 90 measure?
A: PSI 90 measures a hospital's performance on a composite of patient safety indicators, including complications and adverse events that are potentially preventable.

Q2: How are the weights determined?
A: Weights are typically determined by statistical methods and expert consensus, reflecting the relative frequency and clinical significance of each indicator.

Q3: What is a good PSI 90 score?
A: Lower scores indicate better patient safety performance. A score of 1.0 represents average performance, while scores below 1.0 indicate better-than-average safety.

Q4: How many indicators are included in PSI 90?
A: The composite typically includes 10 component PSIs, though the exact composition may vary by reporting program and year.

Q5: Who uses PSI 90 data?
A: Hospitals, healthcare systems, regulators, payers, and quality improvement organizations use PSI 90 for performance measurement and quality improvement initiatives.