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Table 1 Demographic characteristics of participants

From: Associations between oral contraceptive use and risks of hypertension and prehypertension in a cross-sectional study of Korean women

Characteristics

N

%

Age (years)

  

 35–39

978

29.1

 40–44

841

25.1

 45–49

786

23.4

 50–55

751

22.4

BMI

  

 <18.5

120

3.6

 18.5–22.9

1534

45.7

 23–24.9

791

23.6

 ≥25

911

27.1

Education

  

 < High school

936

27.9

 High school

1561

46.5

 > High school

859

25.6

Average household income (US$/month)

  

 <1500

916

27.3

 1500–2500

1088

32.4

 2501–3500

625

18.6

 >3500

727

21.7

Regular exercise

  

 Yes

1514

45.1

 No

1842

54.9

Cigarette smoking

  

 Never

3075

91.6

 Ever

281

8.4

Alcohol consumption (g/day)

  

 0

983

29.3

 >0–5.0

1891

56.3

 >5.0

482

14.4