The article goes through some data regarding the leading causes of death for women during pregnancy. The study it links to indicates that the number one death cause might be a homicide, but the author also mentions that 68% of the data had to be discarded for the study because it didn’t specify if the woman was pregnant or not. If more than half of the data points were discarded, it’s impossible to reach a conclusion such as the one this article indicates, which is reason enough to rate it as a mistake.