Overall concordance of incident atrial fibrillation diagnosis based on Atherosclerosis Risk in Communities data and Centers for Medicare and Medicaid Services data.

ARIC =  Atherosclerosis Risk in Communities.
CMS =  Centers for Medicare and Medicaid Services.
*All CMS includes MedPAR and outpatient claims.
Inpatient CMS includes MedPAR claims.
Outpatient CMS includes outpatient and carrier claims.
% agreement calculated as the number of participants with consistent classification of diagnosed AF from active ARIC cohort follow-up and surveillance of CMS divided by the total number of observations and converted to a percent.
% positive agreement calculated as the number of participants classified as having AF based on both active ARIC cohort follow-up and surveillance of CMS, conditional on being classified as having AF from at least one source, and converted to a percent.
% negative agreement calculated as the number of participants classified as not having AF based on both active ARIC cohort follow-up and surveillance of CMS, conditional on being classified as not having AF from at least one source, and converted to a percent.
Data are limited to participants enrolled in Medicare fee-for-service.