Evaluating the real-world effectiveness of a cognitive behavior therapy-based transdiagnostic program for emotional problems in children in a regular school setting.

•There was an agreement between all three informants (i.e., self, parent, and teacher report) in showing significant reduction in emotional symptoms from pre- to post-test.•Analyses of the 2-minute speech task showed significant changes in length of gaze, vocal quality, length of speech, manifestation of discomfort, and overall conversational flow.•Incremental scores of self-esteem did not act as mediator of change in pre- to post-total anxiety scores.