Table 1.

Serum thyroid hormone (total T₃ ng/ml, total T₄, T₃:T₄ ratio ×1000) reference concentrations for the Amazon river dolphin (Inia geoffrensis) in samples collected from 2003 to 2015

				Age class
TH	Percentile	JF (n = 8)	JM (n = 23)	AM (n = 65)	AF (n = 26)	PF (n = 40)	1st (n = 15)	2nd (n = 21)	LF (n = 14)
tT3	2.5	0.28	0.38	0.25	0.13	0.24	0.27	0.24	0.31
	25	0.32	0.43	0.43	0.39	0.33	0.34	0.32	0.45
	50	0.46	0.57	0.49	0.50	0.39	0.44	0.37	0.57
	75	0.52	0.90	0.59	0.75	0.46	0.46	0.42	0.67
	97.5	0.71	1.53	1.05	1.1	0.76	0.76	0.53	0.94
tT4	2.5	31.7	23.1	20.7	16.5	15.8	15.6	20.8	14.7
	25	39.3	34.9	29.4	32.1	33.2	31.9	35.8	25.6
	50	44.1	42.0	33.1	39.7	38.2	42.7	37.7	36.0
	75	46.7	50.9	40.0	51.1	44.5	47	42.6	44.2
	97.5	51.2	68.7	51.5	96.7	61.5	61.8	50.3	67.8
T 3:T4	2.5	6.0	7.5	7.2	4.7	5.4	5.4	6.5	4.6
	25	8.4	10.6	12.9	9.3	8.0	8.1	7.7	11.7
	50	10.2	13.6	15.2	11.9	10.2	11.1	10.0	15.6
	75	10.7	17.6	18.2	18.6	14.2	16.8	13.5	26.2
	97.5	12.3	32.9	27.7	23.0	24.7	24.7	14.4	44.2

JF: juvenille female, JM: juvenille male, AM: adult male, AF: adult female (nonpregnant, nonlactating), PF: pregnant female (pregnancy with resulting calf), 1st: first trimester, 2nd: combined second and third trimester, LF: lactating female.