The Relationship Between Number of Pregnancies and  Bone Density

M Biranvand; AR Rajaee; B Yoosef-Ghahari; EA Azar-Gashb

Journal of Kermanshah University of Medical Sciences

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The Relationship Between Number of Pregnancies and Bone Density

Author(s):

M Biranvand^1,*,

AR Rajaee¹,

B Yoosef-Ghahari¹,

EA Azar-Gashb¹

1Iran

Journal of Kermanshah University of Medical Sciences:Vol. 8, issue 3; e81395

Published online:Dec 19, 2004

Article type:Research Article

Received:Jul 05, 2004

Accepted:Nov 10, 2004

How to Cite:M BiranvandAR RajaeeB Yoosef-GhahariEA Azar-GashbThe Relationship Between Number of Pregnancies and Bone Density.J Kermanshah Univ Med Sci.8(3):e81395.

Abstract

Introduction: Osteoporosis is characterized by low bone density and increase in the risk of fracture. Because in pregnancy and lactation there are many factors which influence bone mineral density, we sought to assess whether the accumulation of multiple pregnancies and the accompanying extended periods of lactation were a risky factor for low bone mineral density and osteoporosis.

Materials & Methods: This study was a cohort survey. The population consisted of 92 subjects. The experimental group consisted of 53 grand multiparous women who had born 3 or more children as well as 39 women with 0-2 children as the control group. All of them referred to Loghman Hospital during 2001-2002,to be assessed in terms of Bone Mineral Density (BMD) and none of them had any risky factor for osteoporosis. BMD of the lumbar spine and femural neck in two groups was measured by means of Lunar and Dexa method. Their Body Mass Index(BMI) were calculated. Acceptable level of significant for rejecting null hypothesis was p<0.05. In this study x², independent t-test and Mann Withney were employed.

Results: The results showed that there wasn’t any statistically significant difference between age , menarche age , BMI and BMD of spine in both groups , whereas there was statistically significant difference between lactation period, number of children and femoral BMD in the both groups.

Conclusion: This study suggests that Bone Mineral Density Levels can be sustained in multiple pregnancies.

Keywords

Bone Mineral Density

Osteoprosis

Number of pregnancy

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