Skip to main content

Table 1 Descriptive statistics of individual- and area-level characteristics of 196,167 subjects of the National Health Insurance Service-National Sample Cohort 2.0 in South Korea for 2007–2015

From: Incident cardiovascular disease and particulate matter air pollution in South Korea using a population-based and nationwide cohort of 0.2 million adults

Characteristics

Total (n = 196,167)

Sex (%)

Male

53.5

Average age (years, mean ± SD)

 

46.6 ± 11.0

Age (years, %)

30–64

92.1

Income percentile a (%)

0–20%

11.8

20–50%

24.6

50–80%

36.9

80–100%

26.7

Insurance type (%)

Self-employed

40.3

Employee

59.7

Smoking status (%)

Never

67.7

Former

9.2

Current

23.1

Alcohol use (%)

≥ 3 times/week

10.3

Physical activity (%)

≥ 3 times/week

20.4

BMI (%)

≥ 25 kg/m2

33.4

Comorbidity (%)

Hypertension

21.0

Diabetes

6.4

Hyperlipidemia

12.0

Region (%)

Metropolitan cities

45.3

Provinces

54.7

Gross Regional Domestic Productsb (%)

Very low

8.0

Low

17.7

High

36.0

Very High

38.3

Percent of the high school graduated or morec (%)

Very low

9.9

Low

15.9

High

34.4

Very High

39.9

Percent of the elderlyd (%)

Very low

37.6

Low

35.9

High

16.1

Very High

10.3

Cardiovascular disease (n, incidence per 103 person-year)

Total

33,580 (21.3)

Ischemic heart disease

20,604 (13.1)

Myocardial infarction

1367 (0.9)

Stroke

10,201 (6.5)

Heart Failure

3033 (1.9)

  1. Abbreviations: SD standard deviation; BMI body mass index
  2. a NHIS-NSC provided income as percentiles (“The manual for User of the National Health Insurance Service of National Sample Cohort Database”)
  3. b Gross regional domestic products were categorized as very low (< 1110 M USD), low (1110–2600 M USD), high (2600–8354 M USD), and very high (≥ 8354 M USD) based on the distribution across approximately 250 districts
  4. c Percent of high school graduates was categorized as very low (< 34.3%), low (34.3–46.6%), high (46.6–53.2%), and very high (≥ 53.2%) based on the distribution across approximately 250 districts
  5. d Percent of the elderly aged 65 years or more was categorized as very low (< 5.4%), low (5.4–8.2%), high (8.2–14.9%), and very high (≥14.9%) based on the distribution across approximately 250 districts