"Of those who took part 15% said they or their partner had suffered a miscarriage, but the majority of respondents (55%) believed that miscarriages are uncommon (defined as less than 6% of all pregnancies). The truth is that miscarriages end one in four pregnancies and are by far the most common pregnancy complication, the paper says. A fifth of people incorrectly believed that lifestyle choices during pregnancy, such as smoking or using drugs or alcohol, were the single most common cause of miscarriage, more common than genetic or medical causes. In reality, 60% of miscarriages are caused by a genetic problem."