Short version of the Profile of Mood States in persons with
schizophrenia: Construct validity of the Portuguese version
Abstract
Objective There is a strong consensus that mood enhancement is
a primary benefit of physical activity (PA). However, the evidence about
the positive effect of PA on the mood states of persons with
schizophrenia is scarce, probably due to the limited psychometric
properties of the most widely used instrument to assess mood. Therefore,
this study aimed to assess the construct validity of the Portuguese
short version of the Profile of Mood States (POMS-SV) for persons with
schizophrenia. Additionally, a comparative analyse was conducted to
explore the mood states according to different demographic variables.
The sample consisted of 106 in and outpatients (n=47 women) with
schizophrenia. Methods Cronbach’s alpha coefficient was used to
assess internal consistency. Exploratory and confirmatory analyses were
carried out to examine the factor structure and structural validity of
the questionnaire, respectively. Pearson’s correlations were calculated
in order to examine the associations between the POMS subscales.
Mann-Whitney and Kruskal-Wallis tests were used to compare means
differences of POMS subscales and total scales between sociodemographic
groups. Results The Portuguese version of the POMS-SV revealed
a model of 31 items and 6 factors with good internal consistency and
good fit indexes for the application in persons with schizophrenia.
Significant differences were found in gender, marital status, and
engaged PA in the negative mood sub-scales. Conclusion The
POMS-SF exhibited good psychometric properties and appears to be a valid
and reliable instrument to assess mood states in a population of both in
and outpatients with schizophrenia. The results of the present study
support its application in clinical practice and research with expanded
usefulness in PA settings.