Table 2.

Thyroid hormone concentrations, thyroid hormone molar ratios, and albumin concentrations of male and female polar bears.

	Males	Females	Sex	Age
	n = 28	n = 24	f, p	f, p
TT4, nmol/l	10.89 ± 4.33	19.30 ± 6.82	25.06, <0.001	0.99, 0.326
	4.0 – 23.0	11.0 – 32.0
	10.50	18.50
FT4, pmol/l	6.68 ± 2.18	10.75 ± 2.64	32.99, <0.001	0.046, 0.832
	4.0 – 11.0	7.0 – 17.0
	6.00	10.00
TT3, nmol/l (excludes 1 outlier)	1.12 ± 0.35	1.62 ± 0.45	21.08, <0.001	1.98, 0.166
	0.30 – 2.10	0.90 – 2.50
	1.10	1.55
FT3, pmol/l	0.37 ± 0.28	0.72 ± 0.35	24.40, <0.001	6.55, 0.014
	0.10 – 1.30	0.3 – 1.8
	0.30	0.70
TT4:FT4†	1.61 ± 0.29	1.77 ± 0.33	1.48, 0.229	3.24, 0.079
	1.0 – 2.2	1.2 – 2.5
	1.60	1.71
TT3:FT3†	3.85 ± 1.65	2.46 ± 0.55	15.73, <0.001	4.39, 0.042
	1.40 – 8.00	1.39 – 3.67
	3.33	2.40
TT4:TT3	10.00 ± 3.42	12.53 ± 5.49	3.16, 0.082	0.82, 0.370
	5.00 – 20.91	7.12 – 30.0
	9.62	11.62
FT4:FT3	24.21 ± 13.21	17.78 ± 8.40	6.15, 0.017	10.89, 0.002
	7.69 – 60.00	6.67 – 43.33
	20.00	15.36
Albumin, g/dl	4.34 ± 0.34	4.10 ± 0.29	6.010, 0.018	0.069, 0.794
	3.90 – 5.00	3.30 – 4.50

Data are shown as mean ± standard deviation, and median. Analysis of covariance performed on log transformed data except for albumin that was used as is. Significant differences are shown in bold.

^†value * 10³