A study finds that women who work two or more night shifts in a week are at higher risk for miscarriage the following week, reports Tech Times, but other experts dismiss the study’s findings.

The study above is based on observational research, which means it does not establish cause. Other experts believe it is no proof that working night shift causes miscarriages. What’s more, data regarding miscarriages were incomplete, the researchers said.

“This was not a randomized trial. With something like this, there are so many other confounders,” said Dr. Zev Williams, who works at NewYork-Presbyterian/Columbia University Irving Medical Center.

Get the full story at techtimes.com