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Cai et al., Fertil Steril 2017
Retrospective cohort study of 4,798 IVF cycles in women with a BMI < 18.5
Conclusion: a low BMI was associated with reduced live birth rates especially for women of advanced age
Kawwass et al., Fertil Steril 2016
Retrospective cohort study of 494,097 IVF cycles from 2008 to 2013
Underweight women had a statistically significant decreased chance of pregnancy
(adjusted risk ratio 0.97; 95% CI 0.96‐0.99) and live birth (aRR 0.95; 95% CI 0.93‐0.98) per transfer
Both underweight and obese statuses were associated with increased risk of low birth weight and preterm delivery
Smoking
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