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Table 1 General characteristics by duration of OC use (N = 3,386)

From: Association between past oral contraceptive use and the prevalence of hypertension in postmenopausal women: the fifth (2010–2012) Korea National Health and Nutrition Examination Survey (KNHANES V)

Characteristics Duration of OC use P-value
Never user
(n = 2,713)
 < 30 months
(n = 489)
 ≥ 30 months
(n = 184)
Demographic factors
 Age (years) 64.1 ± 0.3 64.4 ± 0.5 65.0 ± 0.8 0.544
 BMI (kg/m2) 24.1 ± 0.1 24.3 ± 0.2 24.9 ± 0.3 0.013
Quartile of monthly household income (n, %) 0.629
 Upper 651 (22.1) 111 (21.2) 43 (23.8)  
 Middle-high 671 (25.9) 118 (23.4) 44 (20.7)  
 Middle-low 673 (26.1) 134 (29.0) 46 (24.0)  
 Low 685 (25.9) 120 (26.4) 50 (31.4)  
Education level     0.198
  ≤ Middle school 2097 (78.3) 405 (79.6) 161 (87.8)  
 High school 456 (16.0) 67 (16.0) 19 (8.9)  
  ≥ University 160 (5.7) 17 (4.4) 4 (3.3)  
Lifestyle and behavioral factors
 Current smoker 98 (4.2) 16 (5.6) 6 (4.6) 0.583
 Heavy drinker 25 (1.0) 4 (0.8) 3 (4.2) 0.018
 Adequate physical activity 403 (14.8) 69 (12.8) 25 (12.5) 0.518
 DM (n, %) 346 (14.3) 76 (15.0) 32 (19.8) 0.297
Dyslipidemia (n, %)     
 Age at menopause (years) 49.7 ± 0.1 49.9 ± 0.2 49.4 ± 0.4 0.548
 Number of pregnancies 4.9 ± 0.1 5.4 ± 0.1 5.9 ± 0.3 0.055
  1. All data are expressed as mean ± standard error or as number (%)
  2. All P-values were calculated using ANOVA or the Rao–Scott chi-square test
  3. OC oral contraceptive, BMI body mass index, DM diabetes mellitus