Working-memory effects of prefrontal tDCS across baseline cognitive-severity groups in schizophrenia: A secondary analysis of a randomized double-blind sham-controlled trial.

The groups differed mainly in overall cognitive severity rather than profile shape.

Working memory survived joint false-discovery-rate correction in both groups, but Holm correction only in the greater-impairment group.

No other domain survived joint correction.

After reclustering without baseline working memory, the time × treatment × group interaction was not significant (estimate, 0.93 T-points; 95% CI, -1.71 to 3.56; p = .4915).