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Table 1 Characteristics and incidence of sudden cardiac arrests in the nationwide cohort data in South Korea from 2003 to 2013

From: The effect of age, gender, economic state, and urbanization on the temporal trend in sudden cardiac arrest: a nationwide population-based cohort study

Characteristics 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 p for trend Overall
Cohort population 1,017,468 1,016,580 1,016,820 1,002,005 1,020,743 1,000,785 998,527 1,002,031 1,006,481 1,011,123 1,014,730
Number of SCAa 314 390 443 442 465 512 521 545 661 705 677  < 0.001 5,675
Crude incidenceb 30.9 38.4 43.6 44.1 45.6 51.2 52.2 54.4 65.7 69.7 66.7  < 0.001 51.4
Adjusted incidencec 30.9 37.1 40.5 39.3 38.9 41.7 41.3 41.4 47.5 48.9 45.4  < 0.001 41.2
Age (years) 64.6 ± 15.9 64.7 ± 16.8 67.1 ± 15.9 66.9 ± 15.8 67.2 ± 15.4 68.9 ± 15.3 67.6 ± 15.0 67.3 ± 16.5 68.9 ± 16.1 68.4 ± 16.4 68.1 ± 16.3 0.003 67.5 ± 16.0
Male (%) 60.2% 60.5% 59.4% 60.9% 60.4% 60.2% 62.2% 56.3% 56.0% 58.7% 59.5% 0.209 59.3%
Proportion by age
 < 20 years 2.5% 2.6% 1.4% 1.1% 0.6% 0.4% 1.0% 1.3% 0.9% 1.8% 1.5% 0.353 1.3%
20–39 years 5.1% 5.6% 5.0% 5.9% 6.2% 3.7% 3.6% 6.2% 4.7% 4.0% 4.1% 0.130 4.8%
40–59 26.1% 23.6% 22.3% 22.9% 21.3% 20.5% 24.6% 21.8% 22.1% 21.1% 21.7% 0.174 22.3%
 ≥ 60 years 66.2% 68.2% 71.3% 70.1% 71.8% 75.4% 70.8% 70.6% 72.3% 73.0% 72.7% 0.027 71.5%
Proportion by incomed
Low 22.6% 19.5% 22.1% 24.0% 27.5% 25.2% 28.2% 26.6% 37.8% 32.6% 31.9%  < 0.001 28.1%
Middle 31.2% 37.9% 35.9% 36.0% 28.2% 36.1% 33.2% 34.9% 27.4% 26.2% 30.7%  < 0.001 32.0%
High 46.2% 42.6% 42.0% 40.0% 44.3% 38.7% 38.6% 38.5% 34.8% 41.1% 37.4% 0.002 39.9%
Proportion by region
Populated urban regionse 46.5% 45.6% 42.7% 42.8% 48.0% 49.4% 44.3% 47.9% 45.4% 48.1% 48.4% 0.113 46.5%
Other regions 53.5% 54.4% 57.3% 57.2% 52.0% 50.6% 55.7% 52.1% 54.6% 51.9% 51.6% 0.113 53.5%
  1. aNumber of SCAs include both out-of-hospital and in-hospital cases that met the criteria for analysis
  2. bCrude incidence: unadjusted incidence rate per 100,000 person-years
  3. cAdjusted incidence: age and gender standardized incidence rates per 100,000 person-years to compare with the year 2003 as the reference
  4. dHousehold income levels are stratified into 10 quartiles from grade 1 to 10, and grade 0 means medical aid beneficiaries (Low: grade 0–3, Middle: grade 4–7, High: grade 8–10)
  5. ePopulated urban region: a region with a population of more than a million. p < 0.05 is marked in boldface. SCA: sudden cardiac arrest