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Table 3 Association between number of live births and change in BMI [β(95% CI)] in three different periods during life-course, INCAP Longitudinal Study

From: Age at childbirth and change in BMI across the life-course: evidence from the INCAP Longitudinal Study

1988 follow-up

 

Live births by the 1988 follow-up (n= 498 women ≥15 y in 1988)

p trend

 

0 child

(n= 422)

1 child

(n= 55)

2 - 3 children*

(n= 21)

  

Model 1

Reference

1.58 (0.98, 2.17)

0.66 (-0.26, 1.58)

  

0.0001

Model 2

Reference

0.55 (-0.03, 1.13)

-0.97 (-1.87, -0.06)

  

0.54

Model 3

Reference

0.73 (-0.03, 1.50)

-1.42 (-3.09, 0.25)

  

0.88

Model 4

Reference

0.74 (-0.03, 1.52)

-1.41 (-3.09, 0.27)

  

0.89

Model 5

Reference

0.74 (-0.05, 1.53)

-1.41 (-3.09, 0.27)

  

0.94

2002 follow-up

 

Live births in the period 1988-2002 (n= 778 women)

p trend

 

0 child

(n=86)

1 child

(n=95)

2 children

(n=151)

3 children

(n=173)

≥ 4 children

(n=273)

 

Model 1

Reference

0.68 (-0.75, 2.11)

2.16 (0.90, 3.41)

2.06 (0.82, 3.29)

0.86 (-0.34, 1.99)

0.94

Model 2

Reference

0.72 (-0.71, 2.15)

2.18 (0.90, 3.47)

2.35 (1.09, 3.59)

1.94 (0.71, 3.17)

0.007

Model 3

Reference

0.84 (-0.61, 2.28)

2.29 (0.99, 3.59)

2.43 (1.17, 3.70)

2.14 (0.88, 3.39)

0.002

Model 4

Reference

0.83 (-0.61, 2.28)

2.30 (0.99, 3.59)

2.42 (1.15, 3.70)

2.12 (0.85, 3.39)

0.003

Model 5

Reference

0.89 (-0.56, 2.34)

2.37 (1.07, 3.67)

2.50 (1.26, 3.82)

2.21 (0.93, 3.49)

0.002

Model 6

Reference

0.90 (-0.55, 2.35)

2.39 (1.09, 3.70)

2.54 (1.26, 3.82)

2.24 (0.95, 3.52)

0.002

2015 follow-up

 

Live births in the period 2002-2015 (n=685 women)

p trend

 

0 child

(n=346)

1 child

(n=188)

2 children

(n=78)

3 children

(n=28)

≥ 4 children

(n=45)

 

Model 1

Reference

-0.28 (-1.68, 1.12)

-0.32 (-1.56, 0.93)

0.12 (-1.02, 1.28)

0.23 (-0.87, 1.32)

0.33

Model 2

Reference

0.06 (-1.30, 1.44)

-0.44 (-1.64, 0.77)

0.22 (-0.90, 1.34)

0.64 (-0.43, 1.71)

0.02

Model 3

Reference

0.12 (-1.23, 1.47)

-0.50 (-1.78, 0.78)

0.26 (-1.06, 1.57)

0.31 (-1.33, 1.96)

0.005

Model 4

Reference

0.12 (-1.24, 1.47)

-0.50 (-1.79, 0.78)

0.25 (-1.06, 1.57)

0.31 (-1.33, 1.96)

0.005

Model 5

Reference

0.16 (-1.18, 1.50)

-0.40 (-1.68, 0.87)

0.35 (-0.96, 1.66)

0.42 (-1.21, 2.06)

0.002

Model 6

Reference

0.18 (-1.16, 1.53)

-0.34 (-1.62, 0.94)

0.36 (-0.95, 1.68)

0.41 (-1.23, 2.05)

0.003

  1. 1988 follow-up:
  2. Exposure= Live births by 1988 Outcome= BMI in 1988
  3. Model 1= Unadjusted; Model 2= Age-adjusted; Model 3= Model 2 + schooling; Model 4= Model 3 + atole exposure; Model 5= Model 4 + maternal schooling
  4. 2002 follow-up:
  5. Exposure= Live births in the period 1988-2002 Outcome= Change in units of BMI over the period 1988-2002
  6. Model 1= Unadjusted; Model 2= Age-adjusted; Model 3= Model 2 + BMI at the beginning of period + live births in the previous period; Model 4= Model 3 + schooling; Model 5= Model 4 + atole exposure; Model 6= Model 5 + maternal schooling
  7. 2015 follow-up:
  8. Exposure= Live births in the period 2002-2015 Outcome= Change in units of BMI over the period 2002-2015
  9. Model 1= Unadjusted; Model 2= Age-adjusted; Model 3= Model 2 + BMI at the beginning of period + total live births; Model 4= Model 3 + schooling; Model 5= Model 4 + atole exposure; Model 6= Model 5 + maternal schooling
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BMC Pregnancy and Childbirth

ISSN: 1471-2393

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