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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)

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

  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
  1. N, number of persons
  2. IR, incidence rate
  3. CI, confidence interval