TY - JOUR
T1 - Symptom dimensions of the psychotic symptom rating scales in psychosis
T2 - A multisite study
AU - Woodward, Todd S.
AU - Jung, Kwanghee
AU - Hwang, Heungsun
AU - Yin, John
AU - Taylor, Laura
AU - Menon, Mahesh
AU - Peters, Emmanuelle
AU - Kuipers, Elizabeth
AU - Waters, Flavie
AU - Lecomte, Tania
AU - Sommer, Iris E.
AU - Daalman, Kirstin
AU - Van Lutterveld, Remko
AU - Hubl, Daniela
AU - Kindler, Jochen
AU - Homan, Philipp
AU - Badcock, Johanna C.
AU - Chhabra, Saruchi
AU - Cella, Matteo
AU - Keedy, Sarah
AU - Allen, Paul
AU - Mechelli, Andrea
AU - Preti, Antonio
AU - Siddi, Sara
AU - Erickson, David
PY - 2014/7
Y1 - 2014/7
N2 - The Psychotic Symptom Rating Scales (PSYRATS) is an instrument designed to quantify the severity of delusions and hallucinations and is typically used in research studies and clinical settings focusing on people with psychosis and schizophrenia. It is comprised of the auditory hallucinations (AHS) and delusions subscales (DS), but these subscales do not necessarily reflect the psychological constructs causing intercorrelation between clusters of scale items. Identification of these constructs is important in some clinical and research contexts because item clustering may be caused by underlying etiological processes of interest. Previous attempts to identify these constructs have produced conflicting results. In this study, we compiled PSYRATS data from 12 sites in 7 countries, comprising 711 participants for AHS and 520 for DS. We compared previously proposed and novel models of underlying constructs using structural equation modeling. For the AHS, a novel 4-dimensional model provided the best fit, with latent variables labeled Distress (negative content, distress, and control), Frequency (frequency, duration, and disruption), Attribution (location and origin of voices), and Loudness (loudness item only). For the DS, a 2-dimensional solution was confirmed, with latent variables labeled Distress (amount/intensity) and Frequency (preoccupation, conviction, and disruption). The within-AHS and within-DS dimension intercorrelations were higher than those between subscales, with the exception of the AHS and DS Distress dimensions, which produced a correlation that approached the range of the within-scale correlations. Recommendations are provided for integrating these underlying constructs into research and clinical applications of the PSYRATS.
AB - The Psychotic Symptom Rating Scales (PSYRATS) is an instrument designed to quantify the severity of delusions and hallucinations and is typically used in research studies and clinical settings focusing on people with psychosis and schizophrenia. It is comprised of the auditory hallucinations (AHS) and delusions subscales (DS), but these subscales do not necessarily reflect the psychological constructs causing intercorrelation between clusters of scale items. Identification of these constructs is important in some clinical and research contexts because item clustering may be caused by underlying etiological processes of interest. Previous attempts to identify these constructs have produced conflicting results. In this study, we compiled PSYRATS data from 12 sites in 7 countries, comprising 711 participants for AHS and 520 for DS. We compared previously proposed and novel models of underlying constructs using structural equation modeling. For the AHS, a novel 4-dimensional model provided the best fit, with latent variables labeled Distress (negative content, distress, and control), Frequency (frequency, duration, and disruption), Attribution (location and origin of voices), and Loudness (loudness item only). For the DS, a 2-dimensional solution was confirmed, with latent variables labeled Distress (amount/intensity) and Frequency (preoccupation, conviction, and disruption). The within-AHS and within-DS dimension intercorrelations were higher than those between subscales, with the exception of the AHS and DS Distress dimensions, which produced a correlation that approached the range of the within-scale correlations. Recommendations are provided for integrating these underlying constructs into research and clinical applications of the PSYRATS.
KW - delusions
KW - hallucinations
KW - principal component analysis
KW - psychosis
KW - schizophrenia
KW - structural equation modeling
KW - symptom rating scales
UR - http://www.scopus.com/inward/record.url?scp=84902584382&partnerID=8YFLogxK
U2 - 10.1093/schbul/sbu014
DO - 10.1093/schbul/sbu014
M3 - Article
C2 - 24936086
AN - SCOPUS:84902584382
VL - 40
SP - S265-S274
JO - Schizophrenia Bulletin
JF - Schizophrenia Bulletin
SN - 0586-7614
IS - SUPPL. 4
ER -