Relationships between Chalder's fatigue scale score and task performances. The task performances were assessed using total error counts (a) and total trial counts (b) of the fatigue-evaluating mental task. Linear regression lines, Pearson's correlation coefficients (R), and P values are shown.
Tanaka et al. Behavioral and Brain Functions 2011 7:46 doi:10.1186/1744-9081-7-46