FOUNDATIONAL TERM
Positive predictive value
阳性预测值
The proportion of positive test results that are true positives; it depends in part on disease prevalence in the tested population.
Study this concept in context
08 · Understanding health research: probability, risk and uncertainty
“Risk cut in half” sounds persuasive. But what was the starting risk, over what period, and in whom? This lesson explains how to reconstruct the information needed to interpret a health statistic.
78 · Interpreting tests: reference ranges, error and false positives
Test reports compress complex physiology into numbers or categories. Interpretation requires measurement context, reference ranges, disease probability, and an understanding of possible errors.
Sources
- NCI：绝对风险的定义
- NCI：癌症统计与个人解释的边界
- Cochrane：效果量与估计
- Cochrane：解释结果与结论
- 英国国家统计局：调查的不确定性
- MedlinePlus: How to Understand Your Lab Results
Definitions come from the published lessons. Read the linked lesson for mechanisms, conditions and examples.