Table 3. Best fit live birth rate per blastocyst for each of seven embryo morphologies
  Morphology
  AA AB BA BB CB BC CC
overall grade good good good fair fair poor poor
all ages combined
  LBR per embryo
  n (embryos)
  average age		 54%
46
34		 44%
37
34		 55%
20
33		 29%
222
36		 32%
17
35		 15%
31
36		 15%
75
38
< 38 years
  LBR per embryo
  n (embryos)
  average age		 58%
35
33		 56%
29
33		 53%
18
32		 34%
143
33		 46%
12
34		 27%
17
33		 33%
29
33

These results were used to assign overall morphology grades of good, fair, and poor.