We evaluated changes in the Samn Perelli and PVT performance over the course of the mission and by 8-h versus 5-h sleep condition using linear mixed-effects regression models, including participant as a random factor (PROC MIXED in SAS), and adjusted for pre-mission sleep duration. We used the same approach to evaluate PVT outcomes by test session of the day. For these models, we allowed the slopes and intercepts to vary by individual participant.
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