| Table 4. Diameter-dependent progression of live birth rates within each blastocyst quality grade | ||||
| Quality grade | Diameter group | n | Live birth rate, % (n) | Trend p-value |
|---|---|---|---|---|
| Best | ≤180μm 180-200μm >200μm |
24 54 92 |
29.2 (7) 44.4 (24) 50.0 (46) |
0.036 |
| Good | ≤180μm 180-200μm >200μm |
48 77 96 |
27.1 (13) 39.0 (30) 37.5 (36) |
0.043 |
| Fair | ≤180μm 180-200μm >200μm |
48 22 15 |
14.6 (7) 27.3 (6) 33.3 (5) |
0.049 |
| Overall | ≤180μm 180-200μm >200μm |
120 153 203 |
22.5 (27) 39.2 (60) 42.9 (87) |
<0.001 |
Trend p-values calculated using Cochran-Armitage test for ordered proportions