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Heavy women's miscarriage risk higher after IVF

Associated Press,  June 28, 2010

Women who are overweight (BMI of 25 or above) have a much higher risk of miscarrying after IVF compared with slim women, according to new research by British doctors.

British doctors tracked 318 women at a London clinic who became pregnant after having in-vitro fertilization from 2006 to 2009, then divided the women according to their Body Mass Index. Women who had a BMI of 18 to 24 were classified as normal. Those who had a BMI of 25 or above were considered overweight, while those above 30 were obese.

After making a statistical adjustment for factors that might have skewed the results — such as age, smoking and medical history — the researchers found overweight and obese women were much more likely to have a miscarriage as thin women. Among women with a normal weight, 22 percent using in-vitro at the clinic had a miscarriage. But among overweight and obese women, the risk of a miscarriage was 33 percent.

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