Learning Objectives

Describe the characteristics of diseases appropriate for screening.
Distinguish between primary , secondary , and tertiary prevention.
Calculate and interpret sensitivity , specificity , positive predictive value , and negative predictive value .
Learn the relationship between sensitivity and specificity when determining the cutpoint ("criterion of positivity") of a screening test.
Understand the relationship between disease prevalence and positive predictive value.
Define length-time bias, lead-time bias, and volunteer bias.

Epiville