. Author manuscript; available in PMC: 2016 Jan 1.

Published in final edited form as: Am Heart J. 2014 Oct 22;169(1):53–61.e1. doi: 10.1016/j.ahj.2014.10.009

Table 2.

Kaplan-Meier 10-year percentage risk (% [95% CI]) of atrial fibrillation by cohort, overall and stratified by P-wave indices using the specified cut-points.

	Framingham	ARIC
10-year % risk of event, overall	8.0 (7.0, 9.0)	5.9 (5.4, 6.4)
PR interval
<120	--^*	5.6 (5.1, 6.2)
120 to 200 ms	7.8 (6.8, 8.9)	5.6 (5.1, 6.2)
>200 ms	13.9 (8.5, 22.4)	9.0 (7.0, 11.5)
P-wave duration
≤120 ms	6.8 (5.8, 7.9)	5.1 (4.6, 5.7)
>120 ms	14.6 (11.5, 18.3)	9.9 (8.4, 11.7)
Maximum P-wave area
<95^th percentile	7.9 (6.9, 9.0)	5.8 (5.3, 6.3)
≥95^th percentile	9.3 (5.5, 15.6)	8.0 (5.6, 11.2)
P-wave terminal force
≤4000 μV·ms	7.4 (6.4, 8.6)	5.3 (4.8, 5.8)
>4000 μV·ms	11.4 (8.6, 15.0)	10.4 (8.6, 12.6)

CI, indicates confidence interval; Framingham, Framingham Heart Study; ARIC, Atherosclerosis Risk in Communities Study. Atrial fibrillation and P-wave indices determined as described by text.

No Framingham Heart Study participants with PR<120 ms developed atrial fibrillation during the 10-year follow-up.