Figure 3From: Rhodiola crenulata extract for prevention of acute mountain sickness: a randomized, double-blind, placebo-controlled, crossover trial AMS occurrence in 2 periods. The incidence of AMS was 65.7% (67/102) in period 1 and 55.9% (57/102) in period 2 (OR: 0.66, 95% CI: 0.45 - 0.98). There were no between-group differences in either period.Back to article page