eISSN: 1896-9151
ISSN: 1734-1922
Archives of Medical Science
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SCImago Journal & Country Rank
3/2011
vol. 7
 
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abstract:

Clinical research
The effect of breast-feeding duration on bone mineral density in postmenopausal Turkish women: a population-based study

Selma Yazici
,
Ugur Korkmaz
,
Melih Erkan
,
Nurdan Korkmaz
,
Ali Erdem Baki
,
Aytekin Alçelik
,
Elif Önder
,
Safinaz Ataoğlu

Arch Med Sci 2011; 7, 3: 486-492
Online publish date: 2011/07/11
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Introduction : In the present study, we investigated the effects of breast-feeding time on bone mineral density (BMD) later in life.

Material and methods : The current study was based on a retrospective analysis of 586 postmenopausal women with a mean age of 60.8 years, who were screened for osteoporosis by dual energy X-ray absorptiometry (DXA).They were classified into 4 groups with respect to the duration of their breast-feeding as never (group 1), 1-24 months (group 2), 25-60 months (group 3), or > 60 months (group 4). Bone mineral density results for the femur neck and lumbar spine were classified into 3 groups according to WHO criteria as normal (T score > –1.0 SD), osteopenia (T score –1.0 to –2.5 SD), and osteoporosis (T score < –2.5 SD). Patients with osteopenia or osteoporosis (T score < –1.0 SD) were considered as having low bone mass (LBM).

Results : We found a correlation between duration of lactation and femur BMD or spine BMD in the study population (r = 0.116, p < 0.005; r = –0.151, p = 0.001, respectively). Significant differences were found between femur BMD and spine BMD of groups in one-way ANOVA analysis (p = 0.025, p = 0.005, respectively). Additionally, when compared with the other three groups, group 4 was older and had longer duration of menopause (p < 0.01). In logistic regression analysis, age and body mass index were found as independent risk factors of LBM [odds ratio: 1.084 (95% CI 1.031-1.141); odds ratio: 0.896 (95% CI 0.859-0.935)], while duration of lactation was not found as an independent predictor of LBM.

Conclusions : In this study, we have found that changes of bone metabolism during lactation had no effect on postmenopausal BMD measured by DXA. Consequently, it can be suggested that long breast-feeding duration is not a risk factor for low bone mass later in life
keywords:

breast-feeding time, bone mineral density, postmenopausal women

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