Psychometric properties of the Spanish self-report version of the panic disorder severity scale.
OBJECTIVE
The goal of the study was to assess the psychometric properties and the factor structure of the Spanish self-report version of the Panic Disorder Severity Scale (PDSS-SR).


METHODS
One hundred and twenty four patients meeting DSM-IV criteria for panic disorder were assessed with the Spanish PDSS-SR, the Anxiety Sensitivity Index-3 (ASI-3), the Sheehan Disability Inventory (SDI) and the Beck Depression Inventory-II (BDI-II). Cronbach's alpha was used to evaluate internal consistency. Pearson correlations were used to evaluate test-retest reliability, convergent and divergent validity. Sensitivity to change data was obtained for 91 patients that had completed a cognitive behavioural therapy. The factor structure was analysed using a confirmatory factor analysis (CFA).


RESULTS
The Spanish PDSS-SR showed excellent internal consistency, good test-retest reliability and adequate convergent validity. Regarding divergent validity, the correlation with the BDI-II was larger than expected. The Spanish PDSS-SR was sensitive to change. Our CFA suggested a two-factor model for the scale.


CONCLUSIONS
The Spanish PDSS-SR has similar psychometric properties as the previous versions of the PDSS-SR and it can become a useful instrument to assess panic symptoms in clinical and research settings in Spanish-speaking countries.
Department of Mental Health, Consorci Sanitari de Terrassa, Spain; Department of Psychiatry and Legal Medicine, Universitat Autònoma de Barcelona, Spain.
Martí
M
Santacana
Department of Psychiatry and Legal Medicine, Universitat Autònoma de Barcelona, Spain; Institute of Neuropsychiatry and Addictions, Hospital del Mar, Barcelona, Spain. Electronic address: miguelangelfullana@gmail.com.
Miquel A
MA
Fullana
Department of Psychobiology and Methodology of Health Sciences, Universitat Autònoma de Barcelona, Spain.
Albert
A
Bonillo
Department of Psychiatry, Hospital Universitari Mútua de Terrassa, Spain.
Miriam
M
Morales
Department of Mental Health, Consorci Sanitari de Terrassa, Spain.
María
M
Montoro
Institute of Neuropsychiatry and Addictions, Hospital del Mar, Barcelona, Spain.
Sílvia
S
Rosado
Department of Mental Health, Consorci Sanitari de Terrassa, Spain.
Roser
R
Guillamat
Department of Mental Health, Consorci Sanitari de Terrassa, Spain.
Vicenç
V
Vallès
Institute of Neuropsychiatry and Addictions, Hospital del Mar, Barcelona, Spain; CIBERSAM (Centro de Investigación en Red de Salud Mental), Instituto de Salud Carlos III, Spain.
Víctor
V
Pérez
Institute of Neuropsychiatry and Addictions, Hospital del Mar, Barcelona, Spain.
Antoni
A
Bulbena
D000328:Adult; D000368:Aged; D015928:Cognitive Behavioral Therapy; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D016584:Panic Disorder / Q000175:diagnosis* / Q000523:psychology* / Q000628:therapy; D011569:Psychiatric Status Rating Scales; D011594:Psychometrics; D015203:Reproducibility of Results; D057566:Self Report / Q000592:standards*; D012720:Severity of Illness Index; D013030:Spain; D011795:Surveys and Questionnaires / Q000592:standards