Table 4. Best fit live birth rate per blastocyst by overall morphology grade stratified by age
  Overall Grade
  Good Fair Poor
Morphology AA/AB/BA BB/CB BC/CC
all ages combined
  LBR per embryo
  n (embryos)
  average age		 51%
103
34		 30%
239
36		 15%
106
37
< 38 years
  LBR per embryo
  n (embryos)
  average age		 56%
82
33		 35%
155
33		 31%
46
33
≥ 38 years
  LBR per embryo
  n (embryos)
  average age		 30%
21
39		 22%
84
40		 8%
60
40
< 35 years
  LBR per embryo
  n (embryos)
  average age		 54%
55
31		 34%
95
32		 24%
22
31
35-37 years
  LBR per embryo
  n (embryos)
  average age		 60%
27
36		 37%
60
36		 37%
24
36
38-40 years
  LBR per embryo
  n (embryos)
  average age		 35%
17
39		 28%
49
39		 12%
2
39