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Table 2 Body mass index and waist circumference in nulliparous and parous women (n = 26,388)

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

  Women ≤ 50 years of age (n = 14,677) Women > 50 years of age (n = 11,711)
  No. Crude mean Adjusted meana 95 % CI No. Crude mean Adjusted meana 95 % CI
BMI (kg/m 2 )
Nulliparous women 3,011 24.8 25.8 25.5, 26.1 2,009 27.3 26.9 26.6, 27.1
Parous women 11,666 25.4 25.6 25.3, 25.9 9,702 27.5 27.3 27.1, 27.5
P- valueb    0.026     <0.001  
Months of lifetime lactation
Never 360 27.5 27.6 27.1, 28.1 345 27.7 27.7 27.2, 28.3
1–6 2,587 25.7 26.1 25.8, 26.5 1,834 27.1 27.2 26.9, 27.6
7–12 3,038 25.4 25.7 25.4, 26.0 2,363 27.2 27.2 26.9, 27.5
13–23 3,513 25.1 25.3 25.0, 25.6 2,753 27.4 27.3 27.0, 27.6
≥ 24 2,168 25.1 25.1 24.8, 25.5 2,407 28.2 27.6 27.2, 27.9
P- trendc    <0.001     0.542  
P- trendd    <0.001     0.675  
Waist cirmcumference (cm)
Nulliparous women 3,012 76.1 79.2 78.5, 80.0 2,009 85.3 84.2 83.6, 84.7
Parous women 11,919 78.8 79.3 78.6, 80.0 9,702 85.0 85.0 84.5, 85.5
P- valueb    0.723     0.004  
Months of lifetime lactation
Never 360 83.4 83.9 82.6, 85.2 345 86.3 86.9 85.7, 88.2
1–6 2,587 79.5 80.5 79.7, 81.4 1,834 84.3 85.1 84.3, 85.9
7–12 3,038 78.8 79.7 78.9, 80.5 2,363 84.3 84.7 83.9, 85.5
13–23 3,513 78.1 78.9 78.1, 79.8 2,753 84.4 84.6 83.8, 85.4
≥ 23 2,168 78.4 78.6 77.7, 79.4 2,407 86.8 85.4 84.5, 86.2
P- trendc    <0.001     0.03  
P- trendd    <0.001     0.085  
  1. Abbreviations: No, number; CI, confidence interval; BMI, body mass index.
  2. a For nulliparous women: Adjusted for maternal age, smoking status, physical activity, education and marital status. For parous women: Adjusted for maternal age, smoking status, physical activity, education, marital status and parity.
  3. bP-value between nulliparous vs parous women. Adjusted for maternal age, smoking status, physical activity, education and marital status.
  4. cP-trend across all five categories of lifetime lactation duration, including the category “never”.
  5. dP-trend across four categories of lifetime lactation duration, excluding the category “never”.