showed a trendp = 0.085
During the nights at 3,600 m, participants in the luteal phase showed a trend toward faster SpO 2 acclimatization between nights 1 and 2, with a mean difference (95% CI) of 2.1% (−0.3 to 4.6, p = 0.085), compared to participants in the follicular phase ( Table 3 ).