1. Elective single embryo transfer in women less than age 38 years reduces multiple birth rates, but not live birth rates, in United States fertility clinics 
Abigail C. Mancuso, M.D., Sheree L. Boulet, Dr.P.H., M.P.H., Eyup Duran, M.D., Erika Munch, M.D., Dmitry M. Kissin, M.D., M.P.H., Bradley J. Van Voorhis, M.D. 
Fertility and Sterility 
Volume 106, Issue 5, Pages (October 2016)
DOI: /j.fertnstert
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2. Figure 1
Live birth rate and multiple birth rate by clinic elective single ET (eSET) rate for fresh IVF cycles in patients <35 years old, US fertility clinics, Estimated means with standard error bars for live birth rates and multiple birth rates after adjusting for significant confounding variables. Live birth rates for patient aged <35 years adjusted for blastocyst transfer rate. Multiple birth rates for patient aged <35 years adjusted for blastocyst transfer rate and parity.
Fertility and Sterility  , DOI: ( /j.fertnstert )
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3. Figure 2
Live birth rate and multiple birth rate by clinic elective single ET (eSET) rate for fresh IVF cycles in patients 35–37 years old, US fertility clinics, Estimated means with standard error bars for live birth rates and multiple birth rates after adjusting for significant confounding variables. Live birth rates for patient aged 35–37 years, adjusted for blastocyst transfer rate, intracytoplasmic sperm injection (ICSI) rate, and patient race. No significant confounding variables were found for multiple birth rates for ages 35–37 years.
Fertility and Sterility  , DOI: ( /j.fertnstert )
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