Range of values containing true population parameter with specified probability (typically 95 percent)
Expansion
Confidence Interval
Purpose
Quantifies uncertainty around point estimate
Clinical Context
95 percent confidence interval reported for sensitivity, specificity, positive predictive value, negative predictive value. Narrow confidence interval indicates precise estimate.
Related Terms
- Standard error
- P-value
Key Points
- “95 percent confidence interval: if repeated 100 times, true value falls in interval approximately 95 times”