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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
...Show all authors
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: [email protected])
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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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References

American Psychiatric Association (2000). Diagnostic and Statistical Manual of Mental Disorders, 4th Edition-Text Revision (DSM-IV-TR). American Psychiatric Association: Washington, DC.Google Scholar
Andreasen, NC, Flaum, M, Arndt, S (1992). The Comprehensive Assessment of Symptoms and History (CASH). An instrument for assessing diagnosis and psychopathology. Archives of General Psychiatry 49, 615–623.CrossRefGoogle ScholarPubMed
Bleuler, E (1911). Dementia praecox oder Gruppe der Schizophrenien. Franz Deuticke Verlag: Leipzig und Wien.Google Scholar
Comrey, AL, Lee, HB (1992). A First Course in Factor Analysis, 2nd edn.Lawrence Erlbaum: Hillsdale, NJ.Google Scholar
Häfner, H, Maurer, K, Löffler, W, Bustamante, S, van der Heiden, W, Riecher-Rössler, A, Nowotny, B (1995). Onset and early course of schizophrenia. In Search for the Causes of Schizophrenia III (ed. Häfner, H. and Gattaz, W. F.), pp. 43–66. Springer Verlag: Berlin.CrossRefGoogle Scholar
Hawkins, KA, McGlashan, TH, Quinlan, D, Miller, TJ, Perkins, DO, Zipursky, RB, Addington, J, Woods, SW (2004). Factorial structure of the Scale of Prodromal Symptoms. Schizophrenia Research 68, 339–347.CrossRefGoogle ScholarPubMed
Huber, G (1966). Reine Defektsyndrome und Basisstadien endogener Psychosen. Neurologie und Psychiatrie 34, 409–426.Google Scholar
Huber, G, Gross, G, Schüttler, R (1975). A long term follow up story of schizophrenia: psychiatric course of illness and prognosis. Acta Psychiatrica Scandinavica 52, 49–57.CrossRefGoogle Scholar
Huber, G, Gross, G, Schüttler, R, Linz, M (1980). Longitudinal studies of schizophrenic patients. Schizophrenia Bulletin 6, 592–605.CrossRefGoogle ScholarPubMed
Kay, SR, Fiszbein, A, Opler, LA (1987). The positive and negative syndrome scale (PANSS) for schizophrenia. Schizophrenia Bulletin 13, 261–276.CrossRefGoogle ScholarPubMed
Kraepelin, E (1899). Psychiatrie – ein Lehrbuch für Studirende und Aerzte. Band II, klinische Psychiatrie. Sechste vollständig umgearbeitete Auflage, pp. 137–214. Verlag von Johann Ambrosius Barth: Leipzig.Google Scholar
Lemos, S, Vallina, O, Fernández, P, Ortega, JA, García, P, Gutiérrez, A, Bobes, J, García, A, Miller, T (2006). Predictive validity of the Scale of Prodromal Symptoms (SOPS). Actas Españolas de Psiquiatría 34, 216–223.Google ScholarPubMed
Lukoff, D, Nuechterlein, KH, Ventura, J (1986). Manual for the expanded Brief Psychiatric Rating Scale. Schizophrenia Bulletin 12, 594–602.Google Scholar
Maß, R, Hitschfeld, K, Wall, E, Wagner, HB (1997). Validität der Erfassung schizophrener Basissymptome. Nervenarzt 68, 205–211.Google Scholar
McGlashan, TH, Walsh, BC, Woods, SW (2010). The Psychosis-Risk Syndrome. Handbook for Diagnosis and Follow-up. New York: Oxford University Press.Google Scholar
Miller, TJ, McGlashan, TH, Rosen, JL, Cadenhead, K, Cannon, T, Ventura, J, McFarlane, W, Perkins, DO, Pearlson, GD, Woods, SW (2003). Prodromal assessment with the structured interview for prodromal syndromes and the scale of prodromal symptoms: predictive validity, interrater reliability, and training to reliability. Schizophrenia Bulletin 29, 703–115, erratum 2004; 30, 217.CrossRefGoogle ScholarPubMed
Miller, TJ, McGlashan, TH, Woods, SW, Stein, K, Driesen, N, Corcoran, CM, Hoffman, R, Davidson, L (1999). Symptom assessment in schizophrenic prodromal states. Psychiatric Quarterly 70, 273–287.CrossRefGoogle ScholarPubMed
Murray, RM, Lewis, SW (1987). Is schizophrenia a neurodevelopmental disorder? British Medical Journal 295, 681–682.CrossRefGoogle ScholarPubMed
Phillips, LJ, Leicester, SB, O'Dwyer, LE, Francey, SM, Koutsogiannis, J, Abdel-Baki, A, Kelly, D, Jones, S, Vay, C, Yung, AR, McGorry, PD (2002). The PACE Clinic: identification and management of young people at ‘ultra’ high risk of psychosis. Journal of Psychiatric Practice 8, 255–269.CrossRefGoogle ScholarPubMed
Rhinewine, JP, Docherty, NM (2002). Affective reactivity of language and right-ear advantage in schizophrenia. Schizophrenia Research 53, 181–186.CrossRefGoogle ScholarPubMed
Roncone, R, Ventura, J, Impallomeni, M, Falloon, IR, Morosini, PL, Chiaravalle, E, Casacchia, M (1999). Reliability of an Italian standardized and expanded Brief Psychiatric Rating Scale-BPRS 4.0 in raters with high vs. low clinical experience. Acta Psychiatrica Scandinavica 100, 229–236.CrossRefGoogle Scholar
Ruggeri, M, Koeter, M, Schene, A, Vàzquez-Barquero, JL, Becker, T, Knapp, M, Knudsen, HC, Tansella, M, Thornicroft, G, EPSILON Study Group (2005). Factor solution of the BPRS-expanded version in schizophrenic outpatients living in five European countries. Schizophrenia Research 75, 107–117.CrossRefGoogle ScholarPubMed
Silverstein, S, Uhlhaas, PJ, Essex, B, Halpin, S, Schall, U, Carr, V (2006). Perceptual organization in first episode schizophrenia and ultra-high-risk states. Schizophrenia Research 83, 41–52.CrossRefGoogle ScholarPubMed
Statistical Package for the Social Sciences (SPSS) (2008). SPSS Statistics, Version 17.0.1. SPSS Inc.: Chicago, IL.Google Scholar
Süllwold, L (1991). HYPERLINK “http://www.springer.com/medicine/psychiatry/book/978-3-540-54155-4” Manual zum Frankfurter Beschwerde-Fragebogen (FBF). Berlin: Springer-Verlag.Google Scholar
Süllwold, L (1992). Frankfurter Beschwerde-Fragebogen. Springer-Verlag: Berlin.Google Scholar
Velligan, D, Prihoda, T, Dennehy, E, Biggs, M, Shores-Wilson, K, Crismon, ML, Rush, AJ, Miller, A, Suppes, T, Trivedi, M, Kashner, TM, Witte, B, Toprac, M, Carmody, T, Chiles, J, Shon, S (2005). Brief psychiatric rating scale expanded version: How do new items affect factor structure? Psychiatry Research 135, 217–228.CrossRefGoogle ScholarPubMed
Velthorst, E, Nieman, DH, Becker, HE, van de Fliert, R, Dingemans, PM, Klaassen, R, de Haan, L, van Amelsvoort, T, Linszen, DH (2009). Baseline differences in clinical symptomatology between ultra high risk subjects with and without a transition to psychosis. Schizophrenia Research 109, 60–65.CrossRefGoogle ScholarPubMed
Weinberger, DR (1987). Implications of normal brain development for the pathogenesis of schizophrenia. Archives of General Psychiatry 44, 660–669.CrossRefGoogle ScholarPubMed
Wilson, DA, Bobier, C, Macdonald, EM (2004). A perinatal psychiatric service audit in New Zealand: patient characteristics and outcomes. Archives of Women's Mental Health 7, 71–79.CrossRefGoogle Scholar
Yung, AR, McGorry, PD (2007). Prediction of psychosis: setting the stage. British Journal of Psychiatry 191 (Suppl. 51), s1–s8.CrossRefGoogle Scholar
Yung, AR, McGorry, PD, McFarlane, CA, Jackson, HJ, Patton, GC, Rakkar, A (1996). Monitoring and care of young people at incipient risk of psychosis. Schizophrenia Bulletin 22, 283–303.CrossRefGoogle ScholarPubMed
Yung, AR, Phillips, LJ, Yuen, HP, Francey, SM, McFarlane, CA, Hallgren, M, McGorry, PD (2003). Psychosis prediction: 12-month follow up of a high-risk (‘prodromal’) group. Schizophrenia Research 60, 21–32.CrossRefGoogle ScholarPubMed
Yung, AR, Yuen, HP, McGorry, PD, Phillips, LJ, Kelly, D, Dell'Olio, M, Francey, SM, Cosgrave, EM, Killackey, E, Stanford, C, Godfrey, K, Buckby, J (2005). Mapping the onset of psychosis–the Comprehensive Assessment of At Risk Mental States (CAARMS). Australian and New Zealand Journal of Psychiatry 39, 964–971.CrossRefGoogle Scholar