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Table 1 Socio-demographic factors and health risk factors associated with hormonal contraception use

From: Past oral contraceptive use and self-reported high blood pressure in postmenopausal women

Characteristics n (% column) % HC Odds ratio(99% CI)
Country of origin Australia 25,664 (75) 79 1.0
  Other 8,348 (24) 64 0.5 (0.4 to 0.5)
Income <$30 K 10,294 (30) 64 1.0
  $30 K – $70 K 8687 (25) 83 2.2 (2.1 to 2.4)
  $70 K+ 7,037 (21) 89 3.7 (3.4 to 4.0)
  Did not disclose 8,271 (24) 69 1.2 (1.1 to 1.3)
Body Mass Index (BMI) <25 15,561 (45) 75 1.0
  25 to 29 10,410 (30) 76 1.1 (1.1 to 1.2)
  +30 5,731 (17) 77 1.4 (1.3 to 1.5)
Family History HBP No 16,994 (50) 71 1.0
  Yes 17,295 (50) 79 1.3 (1.3 to 1.4)
Smoking status Never 22,626 (66) 72 1.0
  Past 9,483 (28) 82 1.5 (1.4 to 1.6)
  Current 2,040 (6) 81 1.9 (1.7 to 2.2)
Alcohol (drinks/week) 0 13,137 (38) 65 1.0
  1-5 9,276 (27) 81 1.7 (1.6 to 1.8)
  6-10 6,889 (20) 82 1.7 (1.6 to 1.9)
  11+ 4,335 (13) 86 1.9 (1.7 to 2.1)
Physical activity Insufficient 10,071 (29) 66 1.0
  Sufficient 24,218 (71) 79 1.6 (1.5 to 1.7)
MHT use No 21,531 (63) 42 1.0
  Yes 12,422 (36) 85 2.3 (2.2 to 2.4)
Number of children 1 3,580 (10) 71 1.0
  2 13,772 (40) 82 1.5 (1.4 to 1.7)
  3 10,184 (30) 78 1.3 (1.1 to 1.4)
  4+ 6,753 (20) 63 0.7 (0.6 to 0.8)
Breastfed No 3,986 (12) 72 1.0
  Yes 29,889 (87) 76 1.1 (1.0 to 1.1)
Age at menopause (years) mean ± SD 49.9 ± 4.5   −0.01(−0.01 to −0.001)*
  1. HC = Hormonal Contraceptive; OR = Odds Ratio; CI = Confidence Interval. % HC is the percentage of women who responded yes to having ever used hormonal contraception. Percentages do not consistently total to 100% due to missing values. Adjusted for age, country of origin, income level, body mass index, family history of high blood pressure, smoking status, alcohol consumption, physical activity, menopausal hormone therapy (MHT) use, number of children, whether they breastfed, age at menopause. *Linear variable, therefore beta value and 99% CI reported.