Abstract
The aim of this study was to investigate the association between female reproductive status and risk of spontaneous abortion among female workers in the Jinchang Cohort. This study used data obtained from a baseline survey of the Jinchang Cohort Study of female workers in Jinchang Industry, the largest nickel production company in China. A standardized, structured questionnaire was used to collect the health status of 18,834 female workers employed by the company from 2011 to 2013. Spearman grade correlation analysis and logistic regression models were used to evaluate the association between female reproductive status and risk of spontaneous abortion. The incidence rate of spontaneous abortion was 6.89%, and fatigue was associated with the risk of spontaneous abortion. The number of pregnancies, age at primary birth and age at the last pregnancy were associated with an increased risk of spontaneous abortion (rs = 0.190, p = 0.000; rs = 0.092, p = 0.000; rs = 0.061, p = 0.000; respectively). In addition, there was a negative correlation between the number of artificial abortions and spontaneous abortions (rs = −0.129, p = 0.000). Female reproductive status was associated with an increased risk of spontaneous abortion in this cohort. More studies are needed to confirm this observed association.
Highlights
Spontaneous abortion refers to the phenomenon by which an embryo or fetus is discharged automatically from the mother’s body for some reason, usually at 28 weeks of pregnancy
This study used the baseline data of the Jinchang Cohort Study, which is an ongoing prospective cohort study with workers that are engaged in mining, concentrating, metallurgy and deep processing [23]
This study showed that the incidence rate of spontaneous abortion was 6.89%, while the incidence rate reported by Gao [25] was 3.6%, and the rate reported by Liu [3] was 4.26%
Summary
Spontaneous abortion refers to the phenomenon by which an embryo or fetus is discharged automatically from the mother’s body for some reason, usually at 28 weeks of pregnancy. In 1957, the WHO recommended that an abortion be defined as a pregnancy terminated at less than weeks due to non-human factors. In 1977, the WHO redefined the definition to mean delivery of a non-surviving fetus with a weight below 500 g before 22 weeks of pregnancy [1]. It has been reported that the incidence rate of spontaneous abortions (
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