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Table 1 Biological and clinical results in IVF cycles.

From: Analysis of pronuclear zygote configurations in 459 clinical pregnancies obtained with assisted reproductive technique procedures

Parameter ≤32 33-37 38-41 Total Statistics
Cycles with clinical pregnancy 107 196 156 459  
IVF 41 90 71 202 n.s.*
ICSI 66 106 85 257 n.s.*
Patients with clinical pregnancy 105 182 149 436  
Maternal age (mean ± SD) 30.3 ± 2.4 35.7 ± 1.4 40.0 ± 1.3 35.9 ± 4.0  
IVF attemps (mean) (1.0) (1.1) (1.1) (1.1)  
Retrieved oocytes°(mean ± SD) 728 (6.8 ± 3.5) 1273 (6.5 ± 3.5) 954 (6.1 ± 3.1) 2955 (6.4 ± 3.4) n.s
Inseminated oocytes°(mean ± SD) 306 (2.9 ± 0.6) 569 (2.9 ± 0.6) 451 (2.9 ± 0.8) 1326 (2.9 ± 0.7) n.s
2 pronucleate zygotes°(mean ± SD) 240 (2.2 ± 0.8) 478 (2.4 ± 0.7) 360 (2.3 ± 0.8) 1078 (2.3 ± 0.8) n.s.
2 pronucleate zygotes°(%) 78.4 84.0 79.8 81.3 0.692 (0.487-0.984)§
Cleaved and transferred embryos°(mean ± SD) 235 (2.2 ± 0.8) 474 (2.4 ± 0.7) 353 (2.3 ± 0.8) 1062 (2.3 ± 0.8) <0.05**
Implantation rate°(%) 107/235 (45.5) 196/474 (41.3) 156/353 (44.2) 459/1062 (43.2) n.s.
  1. * not statistically significant both for maternal ages and for insemination technique
  2. °all values referred to cycle number
  3. § ≤32 vs. 33-37, O.R. (C.I. 95%)
  4. ** ≤32 vs. 33-37, p value significative < 0.05