Table 2 IVF/ICSI outcome characteristics of the different MIIoocytes group

Fresh live birth rate (%)

318(13.67%)

2462(36.54%)

3597(45.47%)

1510(29.25%)

<0.001^c

Cumulative live Birth rate (%)

508(21.84%)

3673(54.52%)

6002(75.88%)

4511(87.39%)

<0.001^c

Age(years)

34.48 ± 5.69

31.80 ± 4.83

30.14 ± 4.03

29.25 ± 3.65

<0.001^b

Oocytes retrieved

3(2–3)

7(6–9)

13(11–15)

20(18–24)

<0.001^a

Maturation rate (%)

0.849 ± 0.225

0.861 ± 0.154

0.887 ± 0.115

0.914 ± 0.087

<0.001^b

Fertilization rate(%)

0.724 ± 0.342

0.760 ± 0.223

0.783 ± 0.185

0.806 ± 0.164

<0.001^b

Cleavage rate(%)

0.878 ± 0.268

0.9014 ± 0.177

0.9112 ± 0.138

0.9124 ± 0.122

0.994^b

Blastocyst rate (%)

0.370 ± 0.450

0.539 ± 0.366

0.609 ± 0.281

0.652 ± 0.234

<0.001^b

Freeze-all rate (%)

684(29.4%)

1287(19.1%)

1428(18.1%)

2649(51.3%)

<0.001^c

Gn duration(days)

9.46 ± 2.23

10.13 ± 1.96

10.39 ± 1.80

10.57 ± 1.88

<0.001^b

Gn dosage(IU)

2400(1725–3000)

2400(1695–3000)

1950(1405–2550)

1665(1275–2212)

<0.001^a

Embryos transferable

1(0–2)

2(2–3)

4(2–5)

6(4–8)

<0.001^a