Table 3.
Outcomes per cycle start and per transfer for donors 25 to < 30 compared with donors < 25 and 30–< 35 years
| Donor age (years) | |||
|---|---|---|---|
| <25 n (%) RR* (95% CI) |
25–< 30 n (%) RR* (95% CI) |
30–< 35 n (%) RR* (95% CI) |
|
| Positive β-hCG | |||
| Per cycle start |
157 (58.4) 0.97 (0.85–1.10) |
241 (60.4) Ref |
55 (51.9) 0.86 (0.70–1.05) |
| Per transfer |
157 (66.5) 0.97 (0.87–1.09) |
241 (68.7) Ref |
55 (55.6) 0.81 (0.67–0.98) |
| Spontaneous abortion | |||
| Per cycle start |
19 (7.1) 1.17 (0.66–2.08) |
24 (6.0) Ref |
6 (5.7) 0.97 (0.41–2.27) |
| Per transfer |
19 (8.1) 1.17 (0.66–2.06) |
24 (6.8) Ref |
6 (6.1) 0.91 (0.39–2.11) |
| Clinical pregnancy | |||
| Per cycle start |
121 (45.0) 0.90 (0.77–1.06) |
199 (49.9) Ref |
42 (39.6) 0.79 (0.61–1.02) |
| Per transfer |
121 (51.3) 0.90 (0.77–1.06) |
199 (56.7) Ref |
42 (42.4) 0.90 (0.77–1.06) |
| Live birth | |||
| Per cycle start |
102 (37.9) 0.87 (0.72–1.04) |
175 (43.9) Ref |
36 (34.0) 0.76 (0.58–1.01) |
| Per transfer | 102 (43.2) | 175 (49.9) | 36 (36.4) |
| 0.87 (0.73–1.04) | Ref | 0.75 (0.58–0.95) | |
| Singleton |
69 (67.7) 0.83 (0.65–1.06) |
123 (70.3) Ref |
21 (58.3) 0.64 (0.43–0.94) |
| Twins |
32 (31.4) 0.98 (0.64–1.49) |
49 (28.0) Ref |
15 (41.7) 1.12 (0.66–1.89) |
| Triplets | 0 (0.0) | 2 (1.1) | 0 (0.0) |
| Unknown | 1 (1.0) | 1 (0.6) | 0 (0.0) |
For cycles using donors < 25 years, there were 269 cycle starts and 236 transfers; for cycles using donors 25–< 30 years, there were 399 cycle starts and 351 transfers; and for cycles using donors 30–< 35 years, there were 106 cycle starts and 99 transfers
*Adjusted for recipient age