Figure 1.

Patient performance on the NIH Toolbox Cognition Battery. Box plot of the absolute scores (N = 161) for each subtest and composite cognitive measures. The box signifies the upper and lower quartiles. The median is represented by a short black line within the box for each cognitive measure, while the mean is represented by a dashed line within each box. Standard deviation is represented by the dashed diamond and outliers are depicted by black dots. Greater variability in performance was seen for the fluid subtests (second to sixth boxes). Patients completed the cognitive assessment between 2 and 40 days following their polysomnography visit. DCCS, Dimensional Change Card Sort; ICA, Inhibitory Control & Attention; LSWM, List Sorting Working Memory; ORR, Oral Reading Recognition; PCPS, Pattern Comparison Processing Speed; PSM, Picture Sequence Memory; PVT, Picture Vocabulary Test.