Table 1. Sex- and age-specific prevalence (%) of atrial fibrillation in three national surveys in Japan.

Age (year)	Mean prevalence in 3 surveys	1980	1990	2000	p value
Men
30-39	0.1	0.2	0.0	0.0	0.46
40-49	0.3	0.3	0.2	0.0	0.55
50-59	0.7	0.8	0.8	0.4	0.70
60-69	1.3	1.0	1.6	1.4	0.64
70+	3.8	3.7	4.3	3.5	0.82
Women
30-39	0.0	0.0	0.0	0.0	-
40-49	0.1	0.1	0.0	0.2	0.40
50-59	0.4	0.5	0.1	0.7	0.13
60-69	0.9	1.4	0.7	0.5	0.09
70+	2.2	2.6	1.9	2.1	0.67
Both sexes
30-39	0.0	0.1	0.0	0.0	0.42
40-49	0.1	0.2	0.1	0.1	0.71
50-59	0.5	0.6	0.4	0.6	0.53
60-69	1.1	1.3	1.1	0.9	0.66
70+	2.9	3.1	2.9	2.7	0.84
30+	-	0.7	0.7	0.9

These data are based on published reports from three national surveys.^3-5

Comparisons in the prevalence of atrial fibrillation among three surveys were performed using the chi squared test.