Table 6.

fT3 concentrations (pmol/L) at different altitude levels in the whole group of subjects and differences relative to PR.

	Mean ± s.d.	n	Differences relative to Pr (adjusted for SaO2)
			Coefficient ± s.e.	P value	95% CI
PR	4.57 ± 0.60	39
BC1	5.26 ± 0.73	38	0.69 ± 0.10	<0.001	0.50; 0.89
C2	4.56 ± 0.74	31	0.02 ± 0.10	0.855	−0.19; 0.22
C3	4.76 ± 0.76	13	0.21 ± 0.14	0.143	−0.07; 0.49
BC2	4.74 ± 0.56	29	0.15 ± 0.11	0.169	−0.62; 0.36
PO	4.89 ± 0.61	38	0.28 ± 0.10	0.004	0.10; 0.47

Variation of fT3 was not sex but SaO₂ (P = 0.018) and paO₂ (P = 0.024) dependent.

Altitudes: PR, Pre expedition = 550 m; BC1, Base Camp 1 = 4.844 m; C2, Camp2 = 6022 m; BC2, Base Camp 2 (after acclimatization) = 4.844 m; C3, Camp3 = 7050 m; PO, Post expedition = 550 m.