Schizophrenia Clinical Trial
Official title:
Multicenter Study on Factors Influencing Real-life Social Functioning of People With a Diagnosis of Schizophrenia
In the last decades the impact of several variables on patients' social functioning has been
investigated with conflicting findings. The involved variables might be grouped in three
main categories: a) disease-related variables; b) personal resources; c) context-related
factors. The present study is aimed to identify factors that affect most real-life
functioning of subjects with schizophrenia and to assess negative and depressive symptoms,
neurocognitive deficits and impairment of social cognition. Domains of negative symptoms and
cognitive dysfunctions most associated with impairment of real-life functioning will be
identified and appropriate data analyses will be carried out to define whether it has a
direct or indirect impact on real-life functioning. The research units of Turin and Genua
will also investigate the relationships between insight into the illness and real-life
social functioning. The research unit of Genua will evaluate prevalence and course of
depressive symptoms, insight impairment and neurocognitive deficits, and will define the
relationships of these aspects with suicidal behavior and real-life social functioning. The
Naples research unit n.1 will investigate the hypothesis that deficits of preattentive and
perceptual functions underlie impaired social cognition and negative symptoms. An
electrophysiological study will be carried out in which abnormalities of event-related
components and gamma rhythm synchronization, relevant to preattentive and perceptual stages
of information processing, will be studied as endophenotypes of the disorder.
The study will also investigate the heritability of disease-related variables by evaluating
them in non-affected, first-degree relatives of subjects with schizophrenia. The research
unit of Bari will test functionality of genetic variants relevant to dopaminergic signaling,
that might confer risk for neurocognitive and related prefrontal dysfunction assessed by
specific functional magnetic resonance imaging (fMRI) paradigms. The Naples research unit n.
6 will perform an association study between selected putative schizophrenia genes and
specific psychometric, neurophysiological and neurocognitive schizophrenia endophenotypes;
moreover, the research unit will search for de novo copy-number variations (CNV) as putative
risk factors for schizophrenia or schizophrenia endophenotypes and for de novo
protein-altering mutations that may contribute to the genetic component of schizophrenia
endophenotypes. The Naples research unit n. 5 will be responsible for defining a
standardized protocol for the assessment of medical comorbidities in subjects with
schizophrenia. All psychiatric research units will contribute to assess the role of factors
related to the context in modulating the impact of variables related to the disease on
real-life social functioning.
The study will last 36 months. The questionnaire for the assessment of physical health and
medical conditions risk factors, as well as the manual concerning the procedures for
screening and assessment of medical comorbidity, will be developed during the first three
months of the study. The recruitment and assessment of all subjects will be completed within
the first semester of the third year.
The analysis of data collected will be completed in the second semester of the third year.
PROCEDURES AND ASSESSMENT TOOLS In all subjects a blood sample of 20 ml will be withdrawn
from a peripheral vein for genetic analyses.
1. Evaluation of aspects related to the disease. For all patients a clinical form will be
filled in with data on age and type of disease onset, course of the disease and
treatments. All available sources of information (patient, family, medical records and
mental health workers) will be used to complete the form.
The Premorbid Adjustment Scale (PAS) will be used to assess premorbid adjustment. It
evaluates the achieved level of functioning before the onset of schizophrenia in four
areas (social accessibility/isolation, peer relationships, ability to function outside
the nuclear family, and capacity to form intimate social - sexual ties) during 4
periods of subject's life (childhood; early adolescence; late adolescence; adulthood),
as well as the highest achieved global level of functioning. It comprises 26 items with
a score ranging from 0 (healthiest end of the adjustment range) to 6 (indicating the
least healthy end).
General psychopathology and positive symptoms will be evaluated using the Positive and
Negative Syndrome Scale (PANSS).
Negative symptoms will be assessed using the Brief Negative Symptom Scale (BNSS). This
scale includes 13 items and assesses 5 domains of negative symptoms: anhedonia,
asociality, avolition, blunted affect and alogia, as well as a control item, not
included in the negative domains, "Distress". For all items of the 5 domains higher
scores are associated with greater impairment/presence of symptoms, while for the item
Distress the highest score is associated with reduction or absence of negative
emotions.
Depressive symptoms will be investigated using the Calgary Depression Rating Scale
(CDRS), a rating scale designed to assess the level of depression in people with
schizophrenia. It includes 9 items (depression; hopelessness; self depreciation; guilty
ideas of reference; pathological guilt; morning depression; early wakening; suicide;
observed depression) with a score ranging from 0 (absent) to 3 (severe).
The possible presence of extrapyramidal symptoms, whose assessment is required to
exclude that the observed negative symptoms are secondary to them, will be verified by
means of the St. Hans Rating Scale (SHRS), a multidimensional rating scale comprising
four subscales: hyperkinesias, parkinsonism, akathisia and dystonia. Each subscale
includes one or more items with a score ranging from 0 (absent) to 6 (severe).
Neurocognitive functions will be evaluated by means of the Measurement and Treatment
Research to Improve Cognition in Schizophrenia (MATRICS) Consensus Cognitive Battery
(MCCB). The battery includes tests for the assessment of seven distinct cognitive
domains: a) processing speed, b) attention/vigilance, c) working memory, d) verbal
learning, e) visual learning, f) social cognition and g) reasoning and problem solving.
The assessment of social cognition, partly included in the MCCB, will be completed
using the Facial Emotion Identification Test and a theory of mind test The Awareness of
Social Inference Test (TASIT). In the Facial Emotion Identification Test (FEIT), 55
faces are presented on a screen; the subject has to choose the facial emotion expressed
by each face among 7 possibilities (anger, disgust, neutral, happiness, surprise, fear,
sadness). The TASIT includes three sections: 1) Emotion Evaluation Test, that examines
the ability to recognize basic emotions shown by other people, in which 28 vignettes
are presented to the subject who has to choose the emotion expressed by a target actor
from a multiple-choice array (surprise, happiness, anger, sadness, anxiety, disgust,
neutral); 2) Test of Social Inference (Minimal), that evaluates the ability to perceive
social inferences, specifically those involving the use of sarcasm; 15 vignettes are
presented and the subject has to answer, for each vignette, four questions regarding,
respectively, what one of the actors was "doing", what was he/she trying to "say", what
was he/she "thinking" and what was he/she "feeling"; 3) Test of Social Inference
(Enriched), that evaluates the ability to perceive social inferences involving lying
and using sarcasm; 16 vignettes are presented and the same questions of the second
section are asked.
2. Assessment of personal resources The evaluation of physical health status will be
carried out through the application of a standardized protocol developed by the unit N.
5 of Naples.
The assessment of coping style will be made by means of the Coping Orientation to Problems
Experienced inventory - Brief, including 28 items, divided into 14 scales: positive
reframing, self-distraction, expression, use of instrumental support, active coping, denial,
religion, humor, behavioral disengagement, use of emotional support, substance use,
acceptance, planning, self-blame. The tool aims to capture a wide range of coping strategies
in real life situations.
The evaluation of self-esteem will be carried out using the Self-Esteem Rating Scale (SERS),
which assesses different aspects of the self-esteem, such as feeling socially and
self-competent, being worth of respect, feeling intelligent and able to solve problems. SERS
is composed of 40 items, with ratings on a 7-point Likert scale.
The recovery style will be evaluated using the Recovery Style Questionnaire. This
self-administered instrument consists of 39 items that refer to the construct of continuity,
ownership, responsibility, curiosity, education, help-seeking, blame, cause, optimism,
impact, fear, liking and satisfaction. For each of them the person is categorized as sealer
or integrator.
Resilience will be evaluated through the Resilience Scale for Adults (RSA). The RSA is a
scale that provides a multidimensional assessment of resilience general characteristics. It
includes 33 items that examine intra-and inter-personal protective factors thought to
facilitate adaptation when facing psychosocial adversity. Factor analysis showed six
factors: a) personal competence, b) positive perception of the future, c) social competence,
d), personal structure, and) family cohesion, f) social resources.
The relationship with mental health services will be evaluated with the Service Engagement
Scale (SES), which includes 16 items grouped into 4 subscales: a) availability, b)
cooperation c) help seeking d) adherence to treatment. The person is given a score on a
4-point Likert scale. c) Evaluation of factors related to the context. For the evaluation of
subject's family social - economic status the Social Economic Status will be used. The SES
is based on: a) education and b) type of work. The educational level is measured on a
7-level scale (1=elementary school, 7=post-degree/specialization courses) and the type of
work is rated on a 9-level scale (1=laborer, 9=high level managerial positions). To
calculate the index the education level and the type of work of each parent is weighted.
The amount of social policies expenditure and the unemployment rate in the geographical
macro-area (Northeast, Northwest, Central, South and Islands) will be taken from the latest
Italian National Institute of Statistic (ISTAT) tables. The availability of a disability
pension, and access to family and social incentives will be investigated through a social -
demographic questionnaire developed ad hoc with which data on sex, age, marital status,
schooling, housing, and luxuries habits will be also collected. For the evaluation of the
social network the Social Network Questionnaire (SNQ) will be used. It is a
self-administered questionnaire that evaluates the structural and qualitative aspects of the
social network. It includes 15 items, grouped into 4 factors: a) quality and frequency of
social contacts; b) practical social support; c) emotional support, d) quality of an
intimate relationship. Each item is rated on a scale from 1 "never" to 4 "always". The
evaluation of the stigma associated with mental illness will be carried out using two
instruments: the Internalized Stigma of Mental Illness (ISMI), which will be administered to
all patients and evaluates the experience of stigma and internalized self-rejection, and the
Perceived Devaluation and Discrimination Scale (PDD), which measures the perceived stigma,
i.e., the attitudes of the general population with respect to mental disorders, which will
be administered to all subjects. The ISMI is a scale that includes 29 items and 5 subscales
for self-assessment of subjective experience of stigma. Each item is rated on a 4-level
Likert scale, where higher scores indicate greater levels of internalized stigma. The PDD
includes 12 items, each of whom is rated on a 5-level Likert scale, with higher scores
indicating greater stigma.
d) Assessment of functional capacity and real-life functioning The functional capacity will
be evaluated using the short version of the Performance-based Skills Assessment, University
of California, San Diego (UCSD) , a performance-based instrument that investigates two
areas: Financial Skills (counting money, counting change and paying bills) and Communication
Skills (to dial a telephone number for emergency, for information, dial a telephone number
from memory; to reschedule an appointment by telephone; to understand and to remember the
instructions on a Medical Doctor Appointment Letter). Individual real-life functioning will
be assessed by the Specific Level of Function Scale (SLOF), a hybrid instrument that
explores many aspects of functioning and is based on judgments by a caregiver/operator (or
the direct observation) of behavior and functioning of patients. It consists of 43 items and
includes the following domains: a) physical efficiency; b) skills in self-care; c)
interpersonal relationships; d) social acceptability; e) community activities (e.g.,
shopping, using public transportation); f) working abilities. The scale that assesses
"Personal and Social Functioning" (PSF) will be also used; it evaluates the areas of
self-care, socially useful activities, personal and social relationships and disturbing and
aggressive behaviors.
GENETIC ASSOCIATION ANALYSES WITH THE PHENOTYPES OF INTEREST The Naples research unit n. 6
will perform an association study between selected putative schizophrenia genes and specific
psychometric, neurophysiological and neurocognitive schizophrenia endophenotypes; moreover,
the research unit will search for de novo copy-number variations (CNV) as putative risk
factors for schizophrenia or schizophrenia endophenotypes and for de novo protein-altering
mutations that may contribute to the genetic component of schizophrenia endophenotypes.
STATISTICAL ANALYSIS OF DATA To identify the factors that affect most real-life functioning
of people diagnosed with schizophrenia multiple regression statistical models will be used.
Real-life functioning and functional capacity indices will be defined as dependent
variables. The three blocks of variables, i.e. disease-related variable, personal resources
and context-related variables, will be the independent variables or predictors. structural
equation model (SEM), that according to some authors is robust against the problem of
multicollinearity occurring in a regression model when there is a linear correlation among
the independent variables, will be used. This analysis allows to draw assumptions on the
causality between the variables and, based on path analysis o identify potential factors
mediating and moderating the relationships between dependent and independent variables. The
explored models will be subsequently tested with confirmatory analyses.
Estimated sample size for this analysis is of at least 5 independent observations for each
index in the model. Therefore, by including in the model: 3 demographic indices (age, sex
and education), 15 variables related to the disease (PANSS-general and PANSS-positive
subscale scores, 2 negative symptom domains derived from BNSS, 6 cognitive domains from the
MCCB, 4 indices of social cognition, derived from the specific section of the MCCB, TASIT
and FEIT, the total score for depression on the Calgary scale), 36 indices related to the
personal resources (6 factors of Resilience, 14 Coping factors, 13 Recovery styles factors,
1 score for Self-Esteem, 1 index of relationship with mental health services, 1 physical
health index) and 10 related to the context (1 index of economic status, 5 indices of
financial opportunities and work/family and social incentives, 2 stigma indices, 2 social
network factors), for a total of 64 indices, it is estimated that an appropriate sample of
patients will be 64x5=320 subjects.
The effects of dichotomous variables (eg, gender) and ordinal (eg, social class) will be
assessed with one- or multiple-way analyses of variance. The analyses will be conducted
using the Statistical Package for Social Science (SPSS).
;
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