Bone Mineral Density in Gravida: Effect of Pregnancies and Breast-Feeding in Women of Differing Ages and Parity
Table 5
Comparison of bone density variables among women with a history of lactation to women who have never breast fed where months of breast-feeding were assessed as a continuous variable.
Never breast fed ( = 35)
Lactation history ( = 97)
value
Maternal age mean ± SD (years)
25.3 ± 4.1
31.5 ± 5.7
0.000
Height mean ± SD
163.8 ± 6.0
162.0 ± 6.4
NS
Prepregnancy weight mean ± SD
63.9 ± 16.0
64.0 ± 11.8
NS
Prepregnancy BMI mean ± SD
23.7 ± 5.0
24.3 ± 4.1
NS
Current weight mean ± SD
72.1 ± 16.6
71.8 ± 13.1
NS
Current BMI mean ± SD
26.8 ± 5.2
27.3 ± 4.4
NS
Weight gain mean ± SD
8.2 ± 5.4
8.4 ± 8.0
NS
Gravidity mean ± SD
1.49 ± 1.1
4.97 ± 2.6
0.000
Parity mean ± SD
1.37 ± 0.84
4.85 ± 2.4
0.000
Months lactation mean ± SD
0
36.9 ± 31.6
0.000
Months pregnancy + lactation mean ± SD
11.4 ± 7.1
77.7 ± 49.6
0.000
FN-BMD mean ± SD
0.807 ± 0.10
0.791 ± 0.11
0.014
FN -scores mean ± SD
[−0.383] ± 0.87
[−0.528] ± 0.99
0.013
FN -scores mean ± SD
[−0.357] ± 0.87
[−0.401] ± 0.98
0.045
LS-BMD mean ± SD
0.963 ± 0.11
0.891 ± 0.39
NS
LS -scores mean ± SD
[−0.757] ± 1.06
[−0.731] ± 1.04
NS
LS -scores mean ± SD
[−0.649] ± 1.01
[−0.608] ± 1.06
NS
SD: standard deviation; NS: not significant; BMI: body mass index; FN: femoral neck; BMD: bone mineral density; LS: lumbar spine.
