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

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

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 SCA^a	314	390	443	442	465	512	521	545	661	705	677	< 0.001	5,675
Crude incidence^b	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 incidence^c	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 income^d
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 regions^e	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%

^aNumber of SCAs include both out-of-hospital and in-hospital cases that met the criteria for analysis
^bCrude incidence: unadjusted incidence rate per 100,000 person-years
^cAdjusted incidence: age and gender standardized incidence rates per 100,000 person-years to compare with the year 2003 as the reference
^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)
^ePopulated urban region: a region with a population of more than a million. p < 0.05 is marked in boldface. SCA: sudden cardiac arrest

ISSN: 2466-1171