Table 3. Overall concordance of incident atrial fibrillation diagnosis based on Atherosclerosis Risk in Communities data and Centers for Medicare and Medicaid Services data.

		All CMS*			Inpatient (MedPAR) CMS			Outpatient CMS
		AF	No AF	Total	AF	No AF	Total	AF	No AF	Total
ARIC Cohort Follow-up	AF	738	93	831	673	158	831	563	268	831
	No AF	288	9015	9303	63	9240	9303	264	9039	9303
	Total	1026	9108	10134	736	9398	10134	827	9307	10134
Kappa 95% confidence interval		0.77 (0.75–0.80)			0.85 (0.83–0.87)			0.65 (0.62–0.68)
% agreement		96			98			95
% positive agreement		66			75			51
% negative agreement		96			98			94

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.