ACT appears to be recommended for patients with poor outcome when treated in other settings. Early intervention seems to be justified as highlighted by younger age being the best predictor of positive changes. Families can be helped considerably, particularly those confronted with patients with persistent disturbing symptoms which do not, however, warrant hospitalization. Finally, the fact that patients with delusional disorder do not seem to improve warrants further research.
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Huguelet et al. (2012) studied this question.
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