Working atypical and/or long hours: Compared with those working day shift jobs, the risk of pregnancy loss for night shift workers is 1.21.The odds ratio of miscarriage is 1.09 for overweight women and between 1.15 and 1.27 for obese women. Weight: For women who are underweight-a body mass index (BMI) less than 18.5-the odds ratio is 1.08.It's thought that smoking accounts for up to 10% of miscarriages. It's important to note that former smokers and smokers that stopped smoking early on in pregnancy are at lower risk, so it's very beneficial to quit smoking before getting pregnant and/or once you find out. Smoking: The risk related to smoking in pregnancy carries an odds ratio of 1.23, which goes up to 1.32 for those smoking 10 or more cigarettes daily.Secondhand smoke: Exposure to secondhand smoke increases the risk of miscarriage by 11%.In fact, a shorter interval of fewer than 3 months provides a lower risk of having another miscarriage than occurs with a pregnancy that begins 6 months or more after miscarriage. Recent miscarriage: In contrast to information in the past, getting pregnant within 6 months of a preceding miscarriage does not increase the risk of a second miscarriage.While the odds ratio for miscarriage goes up for each subsequent miscarriage, it is noteworthy that even with four or more prior miscarriages, the percent of those women who will not miscarry is close to 50%. Previous miscarriages: Roughly 2% of women will have two miscarriages in a row, and 1% of women, will have three or more.Infections that have been clearly associated with miscarriage include malaria, brucellosis, cytomegalovirus, HIV, dengue fever, influenza virus, and vaginal infection with bacterial vaginosis. Many infections have not been shown to increase risk, or studies have shown mixed results. Preventable infections: Infections are thought to account for around 15% of miscarriages.Paternal age: While we often think most about maternal age, increased paternal age also increases the odds of miscarriage, although to a lesser extent than increased maternal age.Maternal age: The risk of miscarriage is roughly 50% for a woman in her early 40s and up to 75% at age 45.Drinking more alcohol during pregnancy increases miscarriage risk, with the risk increasing an estimated 6% to 13% with each additional drink consumed per week. ![]() Drinking Alcohol: Overall, research shows a 1.19 odds ratio of pregnancy loss with exposure to alcohol during pregnancy compared with those that abstained.Amniocentesis: The risk of miscarriage related to amniocentesis is now thought to be as low as.
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