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. 2021 Aug 23;38(10):2735–2743. doi: 10.1007/s10815-021-02293-z

Table 2.

Using Testicular volume, age and serum testosterone to predict successful retrieval of sperm for freezing following testicular biopsy

% with sperm frozen Sensitivity Specificity p–value
  Mean testicular volume (mL)
  ≥ 6 70.0 1.00 0.14 0.33
  ≥ 8 73.7 1.00 0.29 0.10
  ≥ 10 86.7 0.92 0.71 0.006
  ≥ 12 91.6 0.79 0.86 0.02
  ≥ 14 100 0.43 1 0.11
  ≥ 16 100 0.29 1.00 0.27
Age (years)
  ≥ 11 68.0 1.00 0.00  > 0.99
  ≥ 12 72.7 0.94 0.25 0.23
  ≥ 13 73.7 0.82 0.38 0.34
  ≥ 14 88.9 0.47 0.88 0.18
  ≥ 15 100 0.35 1.00 0.13
≥ 16 100 0.35 1.00 0.13
Serum testosterone (nmol/L)
  ≥ 4 78.6 0.79 0.63 0.08
  ≥ 8 85.7 0.43 0.88 0.19
  ≥ 12 83.3 0.36 0.88 0.35
  ≥ 16 100 0.21 1.00 0.27
  ≥ 20 100 0.21 1.00 0.27