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Table 1 Characteristics of women in the HUNT2-study, Norway, 1995–97 (N = 26,388)

From: Lactation and cardiovascular risk factors in mothers in a population-based study: the HUNT-study

  Nulliparous women Parous women
   Lifetime duration of lactation (months)
Variables a n = 5,020 0 n = 705 1 – 6 n = 4,421 7 – 12 n = 5,401 13 – 23 n = 6,266 ≥ 24 n = 4,575
Age, yrs, mean (SD) 44.7 (21.6) 50.7 (13.7) 48.4 (14.5) 49.3 (14.9) 50.1 (14.8) 53.8 (15.7)
Age at delivery of first child, yrs, mean (SD) - 24.2 (5.1) 23.3 (4.4) 23.3 (4.2) 23.4 (3.9) 23.2 (3.7)
Parity,
Para 1 (%) - 29.9 30.8 17.2 2.5 0.4
Para 2 (%) - 38.3 45.1 44.0 45.1 12.9
Para 3 (%) - 21.7 17.4 26.7 35.0 41.2
Para 4 or greater (%) - 10.1 6.8 12.0 17.5 45.5
University/college education (%)b 26.4 13.2 13.4 18.0 21.7 22.4
Never smoked (%) 62.2 37.3 36.7 45.7 50.9 60.5
High physical activityc,d (%) 28.7 14.6 17.6 18.2 20.9 18.2
Unmarried/divorced (%) 61.6 24.4 28.7 23.2 16.5 11.1
Hypertensione (%) 37.5 47.2 36.3 37.5 37.5 44.9
Obesityf (%) 17.0 27.9 18.7 18.0 16.3 21.2
Diabetes (%)g 3.0 4.4 1.9 2.0 2.4 3.7
  1. Abbreviation: SD, standard deviation.
  2. aContinuous variables presented as mean (SD), categorical variables presented as % in each category of lactation.
  3. b Number of women in the category unknown: n = 823.
  4. c High physical activity defined as ≥ 1 hour hard physical activity per week.
  5. d Number of women in the category unknown: n = 2,059.
  6. eHypertension defined as ≥ 140/90 mmHg or current antihypertensive medication.
  7. f Obesity defined as body mass index ≥ 30 kg/m2.
  8. gDiabetes defined as blood glucose ≥ 11.1 mmol/L or self reported diabetes in the questionnaire.