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Table 1 Comparison of testicular volumes by prader orchidometer [8] & by caliper [5] to ultrasound measurements

From: Appraisal of testicular volumes: volumes matching ultrasound values referenced to stages of genital development

Age (years) Prader mean (ml) US mean (ml) Ratio Caliper mean (ml) US mean (ml) Ratio
1 1.64 0.48 3.42 1.52 0.53 2.87
2 1.57 0.46 3.41 1.54 0.53 2.91
3 1.57 0.51 3.08 1.48 0.64 2.31
4 1.74 0.51 3.41 1.86 0.77 2.42
5 1.83 0.58 3.16 1.54 0.66 2.33
6 1.94 0.63 3.08 1.76 0.76 2.32
7 2.03 0.65 3.12 1.74 0.67 2.60
8 2.08 0.66 3.15 1.90 0.80 2.38
9 2.31 0.79 2.92 2.37 0.84 2.82
10 2.67 0.97 2.75 2.52 1.30 1.94
11 3.48 1.33 2.62 3.08 1.70 1.81
12 5.73 2.33 2.46 5.79 2.57 2.25
13 10.16 4.42 2.30 8.65 4.71 1.84
14 15.00 7.31 2.05 10.02 4.53 2.21
15 19.04 8.69 2.19 15.78 8.48 1.86
16 23.92 11.51 2.08 19.29 11.14 1.73
17 24.63 12.12 2.03 20.60 12.42 1.66
18 24.41 13.73 1.78    
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