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TRAIL A and TRAIL B scores and paired tests. This figure shows longitudinal summary data for persons having TRAIL A and TRAIL B scores at all 3 measurement points. The general population norm ± 1 SD, which pertains to both metrics, is indicated in green by the solid and dashed reference lines, respectively. The solid red line indicates the threshold below which scores are considered impaired. SD, standard deviation; TRAIL A and B, Trail Making Test Parts A and B.
