TLI (n=1219) SC (n=1039) Mean difference/Odds ratio (95% confidence interval), p value
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