Étude des résultats des traitements psychosociaux auprès de jeunes adultes présentant un premier épisode psychotique : influence des traits de personnalité
The aim of this thesis was to elucidate the link between personality traits based on the Five Factor Model of personality and therapeutic outcomes of two group treatments for first episode psychosis: cognitive behavior therapy and skills training for symptom management. One hundred and twenty-nine individuals with first episode psychosis were recruited to participate in a randomized controlled trial. Participants were randomized to one of two group treatments or to a wait-list control group. Measures pre- and post-treatment included the shorter version of the Revised NEO personality Inventory (Costa & McCrae, 1992), measures of Brief Psychiatric Rating Scale-Expanded (Lukoff et al., 1986; Ventura et al., 1993) and the shorter version of the Cybernetic Coping Scale coping strategies (Edwards & Baglioni, 1993).  In the first article, personality profiles and stability over time of personality traits of individuals with a first episode of psychosis were investigated. Results showed that individuals with a first episode of psychosis present with different personality profiles. Moreover, personality traits of the first episodes showed stability over time. In the second article, personality profiles and predictive value of personality traits or profiles on therapeutic outcomes of treatments for first episode psychosis were investigated. Results revealed also different personality profiles, none specifically linked to psychotic symptoms. No links could be demonstrated between personality traits and symptom improvements but personality traits and profiles were linked to therapeutic improvements in active coping strategies. In the last article, predictive value of personality traits on therapeutic outcomes accordingly to specific group treatments for first episode psychosis was investigated. Results showed links between personality traits, symptoms and coping outcome measures, according to specific group treatments. Personality traits were particularly linked to therapeutic improvements in active coping strategies.  In sum, this thesis contributed to the field of personality traits in those with a first episode psychosis by investigating the pertinence of personality traits in the choice of psychosocial treatments and highlighting the need for further study considering individual differences in psychosis. Clinical implications are discussed and recommendations for clinical research offered.
NEO-PI-R Coping Outcome First-episode Psychosis Psychosis NEO-PI-R Personality traits Symptoms Outcome