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Factor–structure of the Italian version of the Scale Of Prodromal Symptoms (SOPS): a comparison with the English version

Published online by Cambridge University Press:  28 March 2011

A. Comparelli ,
V. Savoja ,
G. D. Kotzalidis ,
S. W. Woods ,
S. Mosticoni ,
F. Vassallo ,
F. Soscia ,
R. Piccione ,
G. Palma  and
D. Pucci
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A. Comparelli*
Affiliation:
NESMOS Department (Neurosciences, Mental Health and Sensory Functions), Sapienza University, 2nd Medical School, Sant'Andrea Hospital, Via di Grottarossa 1035-1039, 00189 Rome, Italy
V. Savoja
Affiliation:
NESMOS Department (Neurosciences, Mental Health and Sensory Functions), Sapienza University, 2nd Medical School, Sant'Andrea Hospital, Via di Grottarossa 1035-1039, 00189 Rome, Italy
G. D. Kotzalidis
Affiliation:
NESMOS Department (Neurosciences, Mental Health and Sensory Functions), Sapienza University, 2nd Medical School, Sant'Andrea Hospital, Via di Grottarossa 1035-1039, 00189 Rome, Italy
S. W. Woods
Affiliation:
Department of Psychiatry, Yale University School of Medicine, 34 Park Street, New Haven, CT 06519, USA
S. Mosticoni
Affiliation:
M-TWO Systems for Behavioural Sciences, S.N.C., Via Nomentana 201, 00161 Rome, Italy
F. Vassallo
Affiliation:
NESMOS Department (Neurosciences, Mental Health and Sensory Functions), Sapienza University, 2nd Medical School, Sant'Andrea Hospital, Via di Grottarossa 1035-1039, 00189 Rome, Italy
F. Soscia
Affiliation:
NESMOS Department (Neurosciences, Mental Health and Sensory Functions), Sapienza University, 2nd Medical School, Sant'Andrea Hospital, Via di Grottarossa 1035-1039, 00189 Rome, Italy
R. Piccione
Affiliation:
Mental Health Department, ASL Roma E, Borgo Santo Spirito 3, 00193 Rome, Italy
G. Palma
Affiliation:
Mental Health Department, ASL Roma E, Borgo Santo Spirito 3, 00193 Rome, Italy
D. Pucci
Affiliation:
NESMOS Department (Neurosciences, Mental Health and Sensory Functions), Sapienza University, 2nd Medical School, Sant'Andrea Hospital, Via di Grottarossa 1035-1039, 00189 Rome, Italy
P. Girardi
Affiliation:
NESMOS Department (Neurosciences, Mental Health and Sensory Functions), Sapienza University, 2nd Medical School, Sant'Andrea Hospital, Via di Grottarossa 1035-1039, 00189 Rome, Italy
L. Conti
Affiliation:
Dipartimento di Psichiatria, Neurobiologia, Farmacologia e Biotecnologie; Membro della Facoltà di Medicina e Chirurgia;Via Roma 67 56126 Pisa, Italy
R. Tatarelli
Affiliation:
NESMOS Department (Neurosciences, Mental Health and Sensory Functions), Sapienza University, 2nd Medical School, Sant'Andrea Hospital, Via di Grottarossa 1035-1039, 00189 Rome, Italy
*
*Address for correspondence: Dr A. Comparelli, M.D., Ph.D., NESMOS Department, Sapienza University, 2nd Medical School, Sant'Andrea Hospital, Via di Grottarossa 1035-1039, 00189 Rome, Italy. (Email: anna.comparelli@uniroma1.it)
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Abstract

Aims.

The 19-item ‘Scale Of Prodromal Symptoms’ (SOPS) and its semi-structured interview, the Structured Interview for Prodromal Symptoms (SIPS), have been developed to assess prodromes of psychosis. We assessed psychometric properties of the Italian version of the instrument.

Methods.

We collected socio-demographic and clinical data of 128 people seeking first-time psychiatric help in a large Roman area, either as outpatients at community facilities or as inpatients in psychiatric wards of two general hospitals. Participants were administered the Italian version of the SOPS and the 24-item Brief Psychiatric Rating Scale (BPRS). Data were analysed through Pearson's correlation and factorial analysis.

Results.

The English and Italian SOPS versions showed similar psychometric properties and factorial structure. The best-fit model was trifactorial, explaining 90% of total variance, and roughly corresponding to the positive, negative, and general dimensions, with disorganisation spreading over the other dimensions. Compared with the BPRS, the Italian version of the SOPS showed construct validity and convergent validity.

Conclusions.

The factor–structure of the Italian version of the SOPS is similar to those of the English and Spanish versions, in that the factors emerged are the same (positive, negative, and general symptoms). The scale could be used to assess at-risk people in early intervention services.

Keywords

Community mental health servicesearly diagnosisfactor analysisschizophrenia
Type
Original Articles
Information
Epidemiology and Psychiatric Sciences , Volume 20 , Issue 1 , March 2011 , pp. 45 - 54
Copyright
Copyright © Cambridge University Press 2011

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