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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.