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:: Volume 17, Issue 6 (Iranian South Medical Journal 2015) ::
Iran South Med J 2015, 17(6): 1143-1152 Back to browse issues page
Factors affecting inter-birth in rural areas of Zarrindasht (Fars province)
Najaf Zare 1, Mojtaba Soltani2, Mehrab Sayadi2, Abdolreza Rajaeefard3
1- Department of Biostatistics, Infertility Research Center, Shiraz University of Medical Sciences, Shiraz, IRAN , najafzare@sums.ac.ir
2- Department of Biostatistics, Medical School, Shiraz University of Medical Sciences, Shiraz, IRAN
3- Department of Epidemiology, School of Health, Shiraz University of Medical Sciences, Shiraz, IRAN
Abstract:   (4487 Views)

Background: Proper time intervals among pregnancies has a major role in family provision. Investigating the dynamism of the birth spacing, identify factors and their effects on the time interval among pregnancies and determination of optimal spacing is the utmost importance for health planners and families. The purpose was to study the abortion and stillbirth due to short inter-birth spacing, factors affecting inter-births and optimal birth spacing.

Material and Methods: In 2005, a cross-sectional study was conducted in a population of 1064 women of childbearing age in Fars province by multistage random sampling. Information on reproductive history was collected by resident health workers. Variables affecting inter-births were checked by the frailty recurrent events model using S-plus 2000 and SPSS 13 software.

Results: The rate of abortion or stillbirth was 1.7%, which fell with increasing interval between births and reached their lowest (1.9%) at 36-48 months. Mother's level of education, duration of breastfeeding of previous infant, maternal age at birth and father's job showed positive correlation with inter-birth. Mother's age at marriage, having a job other than household, socioeconomic status was negatively correlated with the the time interval to the next delivery. With increasing birth order, inter-birth of each delivery with regard to previous delivery increased on average by one to two months.

Conclusion: The risk of abortion and stillbirth were observed more in subsequent delivery with very low or very long gap interval.

Keywords: reproductive history, optimal spacing, Cox model, frailty model, inter-birth
Full-Text [PDF 397 kb]   (1435 Downloads)    
Type of Study: Original | Subject: Public Health
Received: 2011/09/28 | Accepted: 2013/06/30 | Published: 2014/12/18
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Zare N, Soltani M, Sayadi M, Rajaeefard A. Factors affecting inter-birth in rural areas of Zarrindasht (Fars province). Iran South Med J. 2015; 17 (6) :1143-1152
URL: http://ismj.bpums.ac.ir/article-1-630-en.html

Volume 17, Issue 6 (Iranian South Medical Journal 2015) Back to browse issues page
دانشگاه علوم پزشکی بوشهر، طب جنوب ISMJ

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