Titre de l`article

Titre de l'article
The development of the S-QoL 18: A shortened quality of life questionnaire for patients with
schizophrenia.
Auteur(s)
Laurent Boyer1,2, Marie-Claude Simeoni2, Anderson Loundou3, Thierry D'Amato4, Gilles
Reine5, Christophe Lancon2,6, Pascal Auquier2
Affiliation(s) du ou des auteurs
1
Department of Public Health, La Timone University Hospital, Assistance Publique-Hôpitaux
de Marseille, Marseille, France
2
Department of Public Health, EA 3279 Research Unit, University Hospital, Assistance
Publique-Hôpitaux de Marseille, Marseille, France
3
Department of Clinical Research, University Hospital, Assistance Publique-Hôpitaux de
Marseille, Marseille, France
4
Department of Psychiatry, Le Vinatier University Hospital, Bron, France
5
Department of Psychiatry, Toulon - La Seyne Hospital, Toulon, France
6
Department of Psychiatry, Sainte-Marguerite University Hospital, Assistance PubliqueHôpitaux de Marseille, 13009 Marseille, France
Résumé
Objective - The S-QoL 41 is a French self-administered questionnaire that assesses quality
of life (QoL) among people with schizophrenia. This study aims to validate a shortened
version of the S-QoL for more widespread use in clinical practice.
Methods - We used data from four studies conducted in four psychiatric hospitals in France
(n=507). The item reduction and validation processes were based on both item response
theory and classical test theory. The final version of the S-QoL was tested for construct
validity, reliability, external validity, reproducibility and sensitivity to change. In addition,
differential item functioning (DIF) analyses were performed to see whether all items behave
in the same way in subgroups divided by age, gender, educational level and clinical form.
Results - The S-QoL 18 evaluates eight dimensions: psychological well-being, self-esteem,
family relationships, relationships with friends, resilience, physical well-being, autonomy and
sentimental life. The factor structure accounted for 78% of the total variance. Internal
consistency was satisfactory (item-internal consistency greater than 0.40; Cronbach's alpha
coefficients ranged from 0.72 to 0.84). The scalability was satisfactory, with INFIT statistics
within an acceptable range. In addition, the results confirmed the absence of DIF and
supported the invariance of the item calibrations.
Conclusions - The S-QoL 18 is a short self-administered QoL instrument that has a high
degree of comparability with S-QoL 41 and presents satisfactory psychometric properties.
Future studies should confirm its sensitivity to change.
Mots-clés
Health-related quality of life, Schizophrenia, Outcome assessment, Mental health
Revue
Schizophrenia Research
Source
Schizophr Res. 2010 Aug ; 121(1-3) : 241-50.
Editeur
Elsevier
Lien
http://www.schres-journal.com/article/S0920-9964(10)01340-X/abstract