1. High Negative Predictive Value, Low Prevalence, and Spectrum Effect: Caution in the Interpretation 
Ruben Hernaez, MD, MPH, PhD 
Clinical Gastroenterology and Hepatology 
Volume 15, Issue 9, Pages (September 2017)
DOI: /j.cgh
Copyright © 2017 AGA Institute Terms and Conditions

2. Figure 1
Example of effect of population prevalence on the values of positive and negative predictive values, using a test with a sensitivity and specificity of 85%.
Reprinted, with permission, from van Stralen et al.17
Clinical Gastroenterology and Hepatology  , DOI: ( /j.cgh )
Copyright © 2017 AGA Institute Terms and Conditions