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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