Cognitive domains impaired in the different groups of ALS patients.

<p>K-BNT, Korean version of Boston naming test; RCFT, Rey complex figure test; SVLT Seoul verbal learning test.</p><p>Data are means ± SE.</p><p>Post hoc tests were performed using Bonferroni's method (<0.05).</p>¶<p>Reference group.</p>*<p>p<0.05 compared with cognitively and behaviorally intact ALS patients as a reference group.</p>**<p>p<0.01 compared with cognitively and behaviorally intact ALS patients as a reference group.