- Pregnant women who work at least two night shifts in one week may have a heightened risk of miscarriage the following week, a new study suggests.
Among the 10,047 women in the study who had done some night shift work during weeks three through 21 of their pregnancies, there were 740 miscarriages. Among the 12,697 women who did no night shift work, there were 1,149 miscarriages, according to the report in Occupational & Environmental Medicine. The researchers also found that women who worked 26 or more night shifts between weeks 4 and 22 were more than twice as likely to miscarry as those who worked no nights - but this finding was based on just eight women.While the researchers have found an association, it's not proof that night shift work causes miscarriage, said Dr. Zev Williams, chief of reproductive endocrinology and infertility at NewYork-Presbyterian/Columbia University Irving Medical Center.
In other words, there are many other factors that the night shift workers might have in common that the study did not account for.
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