Table 2.

Serum hormone concentrations in men with normal (n = 40) or low (n = 38) testicular volume.

Parameter	Testicular volume
	Normal (15.0–25.0 mL)	Low (<12.0 mL)
LH (mUI mL−1)	4.8 ± 0.8	5.0 ± 0.8
FSH (mUI mL−1)	4.4 ± 0.7	5.1 ± 0.8
Total testosterone (ng mL−1)	6.1 ± 1.0	5.2 ± 0.8*
17β-oestradiol (pg mL−1)	25.6 ± 4.1	35.8 ± 5.8*
Prolactin (ng mL−1)	16.9 ± 2.7	17.5 ± 2.8

*P < 0.05 (Student's t-test).