Fig. 2From: Assessing data availability and quality within an electronic health record system through external validation against an external clinical data sourcePlot of Pack Year History Reporting to External Questionnaire vs. EHR. Pack year history reported to NHCR (y-axis) against EHR derived pack year history (x-axis). Blue dashed lines indicate a 30-pack year history, the threshold for lung cancer screening. Gray dotted lines are at every 5 years, up to the 30-year lineBack to article page