Age Range, yr, or Race
|
DSP/2 Testes 95% CI, millions
|
DSP/g Parenchyma 95% CI, millions
|
No. of men
|
Weight 2 Testes Parenchyma 95% CI, g
|
Cells Enumerated
|
Time Divisor, d
|
Reference
|
| Homogenization of unfixed testes |
| 26-38 |
82-156 |
3.4-5.5 |
23 |
16-39 |
Sd1 + Sd2 |
7.9 |
Amann and Howards (1980) |
| 21-50 |
137-181 |
4.7-6.1 |
89 |
28-31 |
Sd2 |
2.9 |
Johnson et al (1984b) |
| 51-80 |
77-150 |
2.8-4.7 |
43 |
25-32 |
Sd2 |
2.9 |
|
| 20-79 |
120-225 |
4.2-6.8 |
38 |
27-33 |
Sd2 |
2.9 |
Johnson and Varner (1988) |
| Homogenization of fixed tissues |
| 26-53 |
na |
3.7-7.3 |
10 |
28-40 |
Sa + Sb |
8.9 |
Johnson et al (1981) |
| |
na |
4.0-7.6 |
|
As above |
Sd1 + Sd2 |
7.9 |
|
| 20-48 |
201-283 |
5.6-6.8 |
37 |
40-49 |
Sa + Sb |
8.9 |
Johnson et al (1984a) |
| 50-85 |
126-194 |
3.8-5.4 |
34 |
29-36 |
Sa + Sb |
8.9 |
|
| 20-48 |
225-275 |
5.2-6.8 |
28 |
37-44 |
Sa + Sb |
8.9 |
Johnson et al (1986) |
| 50-90 |
96-146 |
3.2-4.4 |
28 |
28-35 |
Sa + Sb |
8.9 |
|
| 20-48 |
na |
5.5-8.9 |
15 |
na |
Sa + Sb |
8.9 |
Johnson et al (1987) |
| 52-90 |
na |
1.6-5.2 |
15 |
na |
Sa + Sb |
8.9 |
|
| Morphometric analyses (toluidine blue-stained Epon sections) |
| 24-57 |
168-279 |
2.9-14.0 |
3 |
na |
Spherical |
8.9 |
Johnson et al (1980a) |
| 26-53 |
62-139 |
3.9-7.9 |
10 |
28-40 |
Spherical |
8.9 |
Johnson et al (1981) |
| 20-39 |
Na |
4.6-6.3 |
17 |
na |
Spherical |
8.9 |
Johnson et al (1990) |
| Average for fixed homogenates & morphometric data |
| Chinese |
70-173 |
3.4-6.9 |
12 |
22-33 |
Spherical |
8.9 |
Johnson et al (1998) |
| Hispanic |
231-398 |
5.2-8.9 |
8 |
43-61 |
Spherical |
8.9 |
|
White
|
193-318
|
5.5-8.8
|
12
|
38-46
|
Spherical
|
8.9
|
|
|
| Abbreviations: CI, confidence interval; DSP, daily sperm production. |
| aIn some cases, approximate values for 95% CIs were calculated from graphic
presentations of means and standard errors. Three early reports were excluded
because data were combined in Johnson et al
(1984b). It is possible that
some individuals were included in more than 1 listed study. |
