Geographical variation and clustering are found in atrial fibrillation beyond socioeconomic differences: a Danish cohort study, 1987–2015

Table 1 Baseline characteristics at date of inclusion of adults ≥ 30 years with a residential address in Denmark 2011–2015 and characteristics of individuals with incident atrial fibrillation (AF) (including atrial flutter) on date of diagnosis (2011–2015). Incidence rate (IR) and 95% confidence interval (CI)

	Study population at baseline		Incidence of atrial fibrillation (2011–2015)
	N = 3,736,883	%	N = 93,434	%	IR per 100,000 person-years	95% CI
Sex
Men	1,814,936	48.6	50,135	53.7	616.8	611.5-622.3
Women	1,921,947	51.4	43,299	46.3	495.8	491.1-500.4
Age
30–59	2,553,879	68.3	11,966	12.8	111.1	109.1-113.1
60–69	642,007	17.28	20,746	22.2	645.4	636.7-654.3
70–79	349,286	9.4	28,466	30.5	1487.8	1470.6-1505.2
≥ 80	191,711	5.1	32,256	34.5	3346.3	3310.0-3383.0
Education
≤ 9 years	1,179,760	31.6	44,631	47.8	894.5	886.2-902.8
10–12 years	1,672,527	44.86	35,107	37.6	452.5	447.8-457.2
≥ 13 years	884,596	23.7	13,696	14.7	333.0	327.5-338.6
Income
Lowest	827,329	22.1	22,199	23.8	665.7	657.0-674.6
Second lowest	749,959	20.1	21,418	22.9	637.7	629.2-646.3
Middle	734,984	19.7	18,134	19.4	537.5	529.7-545.4
Second highest	719,943	19.3	16,520	17.7	487.3	480.0-494.8
Highest	704,668	18.9	15,163	16.2	445.3	438.3-452.5
Cohabitation
Married or living with a partner	2,508,211	67.1	49,745	53.2	434.1	430.3-437.9
Single	1,228,672	32.9	43,689	46.8	808.7	801.1-816.3

ISSN: 1476-072X