HAC Quality Improvement Metrics 2 — Questions and Answers
Question 1: Which statistical tool is used in healthcare quality improvement to distinguish between common cause and special cause variation?
- Pareto chart
- Control chart (Correct answer)
- Histogram
- Fishbone diagram
Correct answer: Control chart
Control charts use statistical control limits to differentiate random common cause variation from assignable special cause variation.
Question 2: A hospital's 30-day readmission rate for heart failure patients is 22%. If the national benchmark is 18%, what is the performance gap?
- 2 percentage points
- 4 percentage points (Correct answer)
- 6 percentage points
- 8 percentage points
Correct answer: 4 percentage points
The performance gap is 22% - 18% = 4 percentage points above the national benchmark.
Question 3: In the PDSA (Plan-Do-Study-Act) cycle, what is the primary purpose of the 'Study' phase?
- Implement changes on a large scale
- Analyze data to determine if the change produced improvement (Correct answer)
- Identify root causes using fishbone analysis
- Assign team roles and responsibilities
Correct answer: Analyze data to determine if the change produced improvement
The Study phase involves analyzing data collected during the Do phase to evaluate whether the tested change resulted in the expected improvement.
Question 4: Which metric best captures the overall burden of preventable harm in a hospital setting?
- Patient satisfaction score
- Adverse events per 1,000 patient days (Correct answer)
- Average length of stay
- Staff turnover rate
Correct answer: Adverse events per 1,000 patient days
Adverse events per 1,000 patient days is a standardized rate that accounts for patient volume and captures preventable harm burden.
Question 5: What does a Six Sigma process capability level indicate about defect rates?
- 3.4 defects per million opportunities (Correct answer)
- 34 defects per thousand opportunities
- 3.4 defects per thousand opportunities
- 34 defects per million opportunities
Correct answer: 3.4 defects per million opportunities
Six Sigma represents a process producing no more than 3.4 defects per million opportunities, indicating near-perfect quality.
Question 6: Which of the following is an example of a structural quality measure in Donabedian's model?
- Surgical complication rate
- Percentage of physicians board-certified (Correct answer)
- Patient-reported outcome scores
- Time from ED arrival to antibiotic administration
Correct answer: Percentage of physicians board-certified
Structural measures assess the settings and resources available for care, such as provider credentials, staffing ratios, and facility capabilities.
Question 7: A care team wants to reduce medication errors. They use a tool that visually displays the frequency and cumulative percentage of error types. Which tool are they using?
- Run chart
- Scatter diagram
- Pareto chart (Correct answer)
- Control chart
Correct answer: Pareto chart
A Pareto chart ranks categories by frequency and shows cumulative percentage, helping identify the 'vital few' causes responsible for most errors.
HAC Quality Improvement Metrics 2
Which statistical tool is used in healthcare quality improvement to distinguish between common cause and special cause variation?