Table 3.

Crude prevalence and incidence of atrial fibrillation.

AGE GROUP (YEARS)	40–49	50–59	60–69	70–79	≥ 80	TOTAL
TSIMANE
Number of individuals	670	328	204	90	22	1314
Number of AF cases	0	0	0	1	0	1
AF prevalence (per 1,000)	0	0	0	11.11	0	0.76
N with >1 ECG	541	286	157	60	15	1059
Total Person-Years	3726	2190	1074	335	70	7395
Average Risk Years per Person	6.89	7.66	6.84	5.59	4.67	6.98
Number of new AF cases	0	0	0	0	1	1
AF incidence (per 1,000 person years)	0	0	0	0	14.29	0.14
MOSETEN
Number of individuals	208	156	121	39	10	534
Number of AF cases	0	0	0	1	0	1
AF prevalence (per 1,000)	0	0	0	25.64	0	1.87
N with > 1 ECG	96	92	88	25	9	310
Total Person-Years	170	162	153	43	14	542
Average Risk Years per Person	1.78	1.76	1.74	1.73	1.55	1.75
Number of new AF cases	0	0	0	0	0	0
AF incidence (per 1,000 person years)	0	0	0	0	0	0