Table 3. Results of time to completion among three patient groups in each TMT, according to two Trail Making sets.

Value is M±SD. Analysis of covariance (ANCOVA) test was used to determine group difference in TMT time-to-completion with age as a covariate.

AD: Alzheimer's disease, MCI: mild cognitive impairment, NC: normal controls, TMT: Trail Making Test, TMT-A: A form of TMT, TMT-B: B form of TMT, TMT-B&W-A: A form of black and white TMT, TMT-B&W-B: B form of black and white TMT, TMT-KC: Korean consonant version of TMT, TMT-KL: Korean letter version of TMT, TMT-S&C-A: A form of square and circle TMT, TMT-S&C-B: B form of square and circle TMT.