Lead-Time & Length-Time Bias, Interval Cancers & the False-Positive Burden
This lesson is part of the course
In this lesson
You show with numbers why longer survival after screen detection does not prove benefit (lead time), why screening finds the slow tumours (length time), and how many false alarms a person collects over 13 rounds.
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Lessons in this course
- From Programme Data to a 2×2 Table: Sensitivity, Specificity, PPV & NPV Locked
- PPV & NPV Across Target Groups: Prevalence Changes Everything (with a Chart) Locked
- Choosing the Cut-off: ROC Points, Youden Index & Colonoscopy Capacity Locked
- Two-Stage Screening: Serial Testing & Combined Accuracy Locked
- Programme Yield: Detection Rate, Number Needed to Screen & Colonoscopies per Cancer Locked
- Uptake & Coverage by Group: Measuring Equity Gaps (with a Chart) Locked
- Cost per Case Detected & a Simple Cost per QALY Locked
- Lead-Time & Length-Time Bias, Interval Cancers & the False-Positive Burden Locked