Table 1. Mean (range) of progesterone and testosterone concentrations in male gray whales.

Divided by age class.

Age class	Description	Mean testosterone concentrations (range) ng/g	Mean progesterone concentrations (range) ng/g
Calf	Males sighted as calves the year of sampling	0.4 (0.3–0.5)	2.6 (1.8–4.0)
		(n = 4)	(n = 4)
Immature	Males with known year of birth and known age of less than 8 years	0.4 (0.1–0.9)	0.6
		(n = 6)	(n = 1)
Adult	Males known to be 8 years of age or more	1.9 (0.2–9.8)	0.5 (0.3–0.6)
		(n = 16)	(n = 4)
Unknown	Males that do not fit in any other categories	0.6 (0.1–2.6)	NA
		(n = 14)