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Table 1 Effects of sperm concentration in IVF

From: Sperm quality and paternal age: effect on blastocyst formation and pregnancy rates

Sperm concentration (M/ml) Conc < 15 Conc > 15 P value
Mean maternal age (years ± SD) 33.60 ± 4.51 34.36 ± 4.76 0.2235
Number of IVF 52 807  
Mean number of inseminated oocytes ± SD 9.54 ± 5.30 9.83 ± 5.46 0.7268
Rate of fertilization (%) 60.08 66.95 0.7381
Mean number of embryos at day 2 ± SD 5.90 ± 4.56 6.84 ± 4.44 0.0702
Mean number of embryos at day 3 ± SD 5.42 ± 3.81 6.14 ± 4.13 0.1911
Mean number of embryos in prolonged culture ± SD 3.69 ± 4.20 3.87 ± 4.02 0.5102
Mean number of obtained blastocysts ± SD 1.94 ± 2.55 2.06 ± 2.59 0.6040
Rate of blastocyst formation (%) 52.6 53.07 0.9107
Mean number of transferred blastocysts ± SD 0.115 ± 0.323 0.104 ± 0.310 0.8808
Mean number of frozen blastocysts ± SD 1.02 ± 1.58 0.990 ± 1.780 0.7155
Rate of useful blastocysts (%) 58.42 53.22 0.0181
Rate of clinical pregnancy (%) 28.89 37.96 0.228
Rate of miscarriage (%) 30.77 21.80 0.3832
  1. Conc concentration, M/ml million per ml, SD standard deviation