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Osteoporosis International

, Volume 27, Issue 1, pp 319–330 | Cite as

Parity and osteoporotic fracture risk in postmenopausal women: a dose-response meta-analysis of prospective studies

  • Q. Wang
  • Q. Huang
  • Y. Zeng
  • J.-j. Liang
  • S.-y. Liu
  • X. Gu
  • J.-a. LiuEmail author
Original Article

Abstract

Summary

The present dose-response meta-analysis shows linearly decreased hip fracture (HF) risk and nonlinearly decreased osteoporotic fracture (OF) risk associated with increasing number of parity of up to five live births among postmenopausal women.

Introduction

Epidemiological reports suggest that parity is associated with reduced OF risk among women. However, these findings are controversial. Here, we present a meta-analysis of prospective studies of parity in relation to OF risk.

Methods

We performed systematic searches using Medline and Embase from January 1, 1966, to December 31, 2014, with limits of language in English and prospective study design. Relative risks (RRs) and confidence intervals (CIs) were derived mainly using random-effects models. Categorical, dose-response, heterogeneity, publication bias, and subgroup analyses were conducted.

Results

We analyzed 10 articles of 19 independent reports from 1966 to 2014, comprising a total of 217,295 participants and 26,525 cases of OF. Compared to nulliparous women, the OF and HF risks of parous women with at least one live birth were reduced by 11 % (95 % confidence interval (CI) 3–19 %; I 2 = 77.1 %, p < 0.001) and 26 % (95 % CI 17–35 %; I 2 = 19.5 %, p = 0.287), respectively. Representative nonlinearly and linearly inverse dose-response associations were found between parity (range of 0–6) and OF risk (p nonlinearity = 0.0163; I 2 = 79.7 %, p < 0.001), and between parity (range of 0–5) and HF risk (p nonlinearity = 0.054; I 2 = 76.5 %, p < 0.001), respectively. The lowest risk reduction for OF of 25 % (95 % CI 16–33 %) was observed for five live births. And, the summary risk reduction for HF was 12 % (95 % CI 9–15 %) for each one increased live birth.

Conclusions

We found that increasing number of parity is associated with linearly reduced HF risks among women. The association between parity of six or more live births and HF risks should be studied further in future.

Keywords

Fracture Hip Meta-analysis Osteoporosis Parity Women 

Notes

Acknowledgments

The work has been supported by the National Science Foundation of China (grant no. 81573235), Fundamental Research Funds for the Central Universities (grant no. HUST:2014TS048), Health and Family Commission of Wuhan Municipality (grant no. WG15D20), and Wuhan Jiangan District Science and Technology Bureau (grant no. 20114111904). We convey apology to authors of studies with similar interest while not involved in our analyses due to language limitation. The funding sources had no role in the study design, data collection, analysis, data interpretation, or the writing of the report.

Compliance with ethical standards

Conflicts of interest

Qi Wang, Qin Huang, Yun Zeng, Jiao Jun Liang, Shu Yun Liu, Xue Gu, and Jun An Liu declare that they have no conflict of interest.

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Copyright information

© International Osteoporosis Foundation and National Osteoporosis Foundation 2015

Authors and Affiliations

  • Q. Wang
    • 1
  • Q. Huang
    • 3
  • Y. Zeng
    • 1
  • J.-j. Liang
    • 4
  • S.-y. Liu
    • 1
  • X. Gu
    • 1
  • J.-a. Liu
    • 2
    Email author
  1. 1.Department of Epidemiology and Biostatistics, School of Public HealthTongji Medical College, Huazhong University of Science and TechnologyWuhanChina
  2. 2.Department of Social Medicine and Health Management, School of Public HealthTongji Medical College, Huazhong University of Science and TechnologyWuhanChina
  3. 3.Department of Medical Rehabilitation, Union HospitalTongji Medical College, Huazhong University of Science and TechnologyWuhanChina
  4. 4.Department of Occupational HygieneWuhan Hospital for the Prevention and Treatment of Occupational DiseasesWuhanChina

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