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ICSI: intracytoplasmic sperm injection; IMSI: intracytoplasmic morphologically selected sperm injection
| Age (years) | ICSI | IMSI | P-value |
| < 35 | 57 (40.4%) | 2 (18.2%) | 0.112 |
| 35 - 37 | 60 (45.8%) | 3 (27.2%) | 0.200 |
| 38 - 40 | 44 (37.2%) | 5 (15.1%) | 0.287 |
| > 40 | 9 (16.1%) | 0 | 0.051 |
