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Table 2 Differences in reporting of live birth rates depending on reference point, 2005–2016

From: Time associations between U.S. birth rates and add-Ons to IVF practice between 2005–2016

Study year 2005 2010 2015 2016 p-value
fnd-cycles n 27,947 30,425 21,771 19,137  
Live birth rates/cycle- start (%) 27.8 30.2 23.9 22.2  < 0.0001
Live birth rates/embryo transfer (%) 34.5 36.8 36.7 36.3  < 0.0001
Gain in absolute percentage points  + 6.7  + 6.4  + 12.8  + 14.1  < 0.0001
  1. This table demonstrates the gain in absolute percentage points for IVF centers when reporting live births with reference point embryo transfer rather than cycle start. The gain more than doubled after 2010, reflective of more “all-freeze” cycles and other IVF practice changes after 2010