Table 1.

Acute mountain sickness and headache

	AMS– (n= 9)			AMS+ (n= 9)
GROUP:
CONDITION:	Normoxia	Hypoxia	Δ	Normoxia	Hypoxia	Δ
LL (points)	0 ± 1	4 ± 2	3 ± 2	1 ± 1	8 ± 3*†	8 ± 3†	Group and condition main effects/Group × Condition interaction
ESQ-C (AU)	0.0 ± 0.0	0.4 ± 0.2*	0.3 ± 0.2	0.0 ± 0.0	2.0 ± 1.3*†	2.0 ± 1.3†	Group and condition main effects/Group × Condition interaction
VAS (mm)	1 ± 2	6 ± 9	6 ± 8	0 ± 0	47 ± 27*†	47 ± 27†	Group and condition main effects/Group × Condition interaction

Values are mean ±s.d.; AMS–, subjects without (AMS–) and with (AMS+) acute mountain sickness; main effect for group indicates a pooled (normoxia + hypoxia) difference (P < 0.05) between AMS–versus AMS+; main effect for condition indicates a pooled (AMS–+ AMS+) difference (P < 0.05) between normoxia versus hypoxia;

^*different within and

^†between groups (P < 0.05); LL, Lake Louise score; ESQ-C, Environmental Symptoms Questionnaire Cerebral Symptoms score in arbitrary units (AU); VAS, Visual Analogue Scale score; Δ, delta value (hypoxia minus normoxia).