| 1998 PREGNANCY SUCCESS RATES |
| Type
of Cycle |
Age
of Woman
|
|
<35 |
35-37 |
38-40 |
>40c |
| Fresh
Embryos From Nondonor Eggs |
| Number of cycles |
27,858 |
14,146 |
12,037 |
7,609 |
| Percentage of cycles
resulting in pregnancies |
37.2 |
31.9 |
24.2 |
13.4 |
| Percentage
of cycles resulting in live birthsb |
32.0 |
26.0 |
17.9 |
8.2 |
| Percentage of
retrievals resulting in live birthsb |
35.2 |
30.2 |
21.9 |
10.7 |
| Percentage of
transfers resulting in live birthsb |
37.3 |
32.0 |
23.5 |
11.8 |
| Percentage of
cancellations |
9.3 |
13.8 |
18.1 |
23.3 |
| Average
number of embryos transferred |
3.4 |
3.6 |
3.7 |
3.9 |
| Percentage of
pregnancies with twins |
30.6 |
26.6 |
22.2 |
13.9 |
| Percentage of
pregnancies with triplets or more |
12.5 |
10.3 |
6.8 |
4.1 |
| Percentage of
live births having multiple infantsb |
42.0 |
36.5 |
27.8 |
18.3 |
| Frozen
Embryos From Nondonor Eggs |
| Number of transfers |
5,299 |
2,369 |
1,516 |
874 |
| Percentage of
transfers resulting in live births b |
21.0 |
18.7 |
17.8 |
12.8 |
| Average number
embryos transferred |
3.2 |
3.3 |
3.3 |
3.3 |
| Donor
Eggs |
| Number of fresh
embryo transfers |
592 |
558 |
982 |
3,173 |
| Percentage of
fresh transfers resulting in live births b |
42.2 |
44.3 |
40.0 |
40.6 |
| Average number of
fresh embryos transferred |
3.3 |
3.3 |
3.4 |
3.4 |
| Number of frozen
embryo transfers |
223 |
165 |
289 |
1,083 |
| Percentage of
frozen transfers resulting in live births b |
27.4 |
21.2 |
23.9 |
22.5 |
| Average number of
frozen embryos transferred |
3.3 |
3.2 |
3.4 |
3.3 |
