Table 1. Characteristics of the Study Groups.

	Spinal Cord Injury		Able-Bodied
	Eugonadal	Hypogonadal	Eugonadal	Hypogonadal	p value
n	16	14	11	27	-
Age (years)	33 ± 7	41 ± 10	36 ± 7	36 ± 9	0.06
Height (m)	1.79 ± 0.08	1.78 ± 0.07	1.82 ± 0.10	1.76 ± 0.08	NS
Weight (kg)	88.1 ± 20.1	81.7 ± 15.2	87.6 ± 11.3	83.6 ± 14.0	NS
BMI (kg/m2)	27.3 ± 4.5	25.4 ± 4.0	26.4 ± 3.3	26.8 ± 3.8	NS
DOI (years)	11 ± 7	12 ± 10	-	-	NS
Paraplegia/Tetraplegia (n)	11/5	10/4	-	-	NS
Total Testosterone (nmol/l)	17.4 ± 4.4	7.4 ± 3.8 *,†	16.7 ± 4.3‡	7.7 ± 2.3¶	<0.0001
Luteinizing Hormone (mIU/ml)
GnRH 10 μg	1.4 ± 1.0	2.0 ± 1.6	2.5 ± 1.6	2.5 ± 2.7	NS
GnRH 50 μg	1.6 ± 1.4	2.1 ± 2.5	3.3 ± 2.6	2.5 ± 5.4	NS
GnRH 100 μg	3.3 ± 3.0	2.0 ± 2.1	2.8 ± 1.9	5.2 ± 8.9	NS
Follicle Stimulating Hormone (mIU/ml)
GnRH 10 μg	1.4 ± 1.1	2.0 ± 2.2	2.9 ± 2.7	3.6 ± 3.3	NS
GnRH 50 μg	1.6 ± 1.6	1.7 ± 2.2	3.2 ± 3.9	3.2 ± 3.6	NS
GnRH 100 μg	2.7 ± 2.6	1.8 ± 1.8$	2.3 ± 2.8	5.0 ± 3.7 #	<0.01

Data are presented as group mean ± SD. Abbreviations: BMI=body mass index; DOI= duration of injury; GnRH= gonadotropin releasing hormone; NS= not significant; kg= kilograms; nmol/l= nanomoles per liter; mIU/ml= milli-international units per milliliter; μg= micrograms.

^*p<0.0001: SCI-Eugonadal vs. SCI-Hypogonadal;

^†p<0.0001: AB-Eugonadal vs. SCI-Hypogonadal;

^‡p<0.0001: AB-Eugonadal vs. SCI-Hypogonadal;

^¶p<0.0001: AB-Eugonadal vs AB-Hypogonadal;

^#p<0.01: SCI-Hypogonadal vs. AB-Hypogonadal;

^$p<0.05: SCI-Hypogonadal vs. SCI-Eugonadal.