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Logo of bmcpsycBioMed Centralsearchsubmit a manuscriptregisterthis articleBMC Psychiatry
BMC Psychiatry. 2011; 11: 105.
Published online Jun 28, 2011. doi:  10.1186/1471-244X-11-105
PMCID: PMC3151206
A cross-sectional testing of The Iowa Personality Disorder Screen in a psychiatric outpatient setting
Ingrid Olssøn,corresponding author1 Øystein Sørebø,2 and Alv A Dahl3
1Department of Psychiatry, Innlandet Hospital Trust, N-2318 Hamar, Norway
2Schools of Business and Social Sciences, Buskerud University College, N-3511 Hønefoss, Norway
3Department of Oncology, Oslo University Hospital and University of Oslo, N-0310 Oslo, Norway
corresponding authorCorresponding author.
Ingrid Olssøn: ingrid.olsson/at/; Øystein Sørebø: oystein.sorebo/at/; Alv A Dahl: a.a.dahl/at/
Received February 7, 2011; Accepted June 28, 2011.
Patients suspected of personality disorders (PDs) by general practitioners are frequently referred to psychiatric outpatient clinics (POCs). In that setting an effective screening instrument for PDs would be helpful due to resource constraints. This study evaluates the properties of The Iowa Personality Disorder Screen (IPDS) as a screening instrument for PDs at a POC.
In a cross-sectional design 145 patients filled in the IPDS and were examined with the SCID-II interview as reference. Various case-findings properties were tested, interference of socio-demographic and other psychopathology were investigated by logistic regression and relationships of the IPDS and the concept of PDs were studied by a latent variable path analysis.
We found that socio-demographic and psychopathological factors hardly disturbed the IPDS as screening instrument. With a cut-off ≥4 the 11 items IPDS version had sensitivity 0.77 and specificity 0.71. A brief 5 items version showed sensitivity 0.82 and specificity 0.74 with cut-off ≥ 2. With exception for one item, the IPDS variables loaded adequately on their respective first order variables, and the five first order variables loaded in general adequately on their second order variable.
Our results support the IPDS as a useful screening instrument for PDs present or absent in the POC setting.
Keywords: Personality disorders, Screening instrument, Iowa Personality Disorder Screen, Psychometrics
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