Table 1.

Demographics, ejaculated sperm characteristics, and testicular germ cell populations by testicular histology type of the 43 men included in the analysis. All values are expressed as median (25^th, 75^th percentiles).

	Testicular Histology
	Normal^† (n=11)	Sertoli-Cell Only (n=20)	Maturation Arrest (n=8)	Hypospermatogenesis (n=4)	p-value
Age (years)	30 (29,37)	35 (32,39)	31 (29,33)	35 (31,37)	.32
Sperm Characteristics
Semen Volume (ml)	1.8 (0.5,2.7)^**	3 (2.5, 3.0)	4 (3.8,4.8)	2.5 (0.7,6)	.01
Sperm Concentration (10⁶/ml ejaculate)	0 (0,0.2)	0 (0,0)	0 (0,0.01)	0 (0,0)	.25
Total Sperm Count (10⁶/ejaculate)	0 (0,0.3)	0 (0,0)	0 (0,0.04)	0 (0,0)	.15
Germ Cell Populations (per tubule cross-section)
Spermatogonia	11 (9,14)	0 (0,0)^**	16 (10,18)^*	6.8 (6.7, 7.0)	0.001
Spermatocytes	14 (13,15)	0 (0,0)^**	19 (14,29)^*	5.2 (4.9,8.6)	0.001
Spermatids (type a+ type b)	9 (5,13)^*	0 (0,0)^**	1.5 (0.3,2.5)	3.1 (0.8,4.4)	0.001
Spermatids (type c+ type d)	8 (7,9)^*	0 (0,0)^**	0 (0,0.9)	0.8 (0.7,1.6)	0.001

^†

Nine of these men had obstructive azoospermia.

^**

p<0.01 c.f. other groups;

p<0.05 c.f. other groups