Age, mean (SD) |
35.15 (4.27) |
33.47 (4.75) |
1.68 (1.31 to 2.05),
<0.001 |
Number of oocytes retrieved, mean (SD) |
12.15 (6.64) |
10.87 (6.37) |
1.28 (0.74 to 1.82), <0.001 |
Fresh embryo transfer performed, n (%) |
1186 (97.29) |
1011 (97.30) |
1.03 (0.61 to 1.72), 0.921 |
Cycles with embryos cryopreserved,
n (%) |
602 (49.38) |
455 (43.79) |
1.25 (1.06 to 1.48),
0.008 |
Embryos transferred, mean (SD) |
1.20 (0.48) |
1.17 (0.44) |
0.02 (-0.01
to 0.08), 0.059 |
Embryos cryopreserved, mean (SD) |
1.37 (2.03) |
1.10 (1.68) |
0.08
(0.10 to 0.41), 0.001 |
Embryo utilisation rate, % (n/100 2PNs) |
37.08 (3141/8472) |
36.29
(2357/6495) |
1.03 (0.97 to 1.11), 0.323 |