Evidence map›Paper›PMID 32694510›Full record

SynthesisTranslational psychiatry2020

A systematic review and narrative synthesis of data-driven studies in schizophrenia symptoms and cognitive deficits.

Tesfa Dejenie Habtewold, Lyan H Rodijk, Edith J Liemburg, Grigory Sidorenkov, H Marike Boezen, Richard Bruggeman, Behrooz Z Alizadeh

Registry-linked trialOpen access · goldAbstract readSystematic Review
In one paragraph

Synthesis in Translational psychiatry, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT07196423 (Glutamate Changes as a New Neurocognitive Marker in Psychosis), which is not on this map. Cited by 59 papers, 4 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
59citing papers in PubMed, 4 pooled it
7.0field-weighted citation impact, top 2% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

NCT07196423 narecruitingnot on this mapstarted 2026, after this paper: background citation

Glutamate Changes as a New Neurocognitive Marker in Psychosis

TypeinterventionalSponsorUniversity of NottinghamRan2026 to 2027Enrolled106ConditionsFirst Episode Psychosis (FEP), PsychosisArmsTranscranial direct current stimulation (tDCS), Magnetic Resonance Imaging
3 · Its place in the literature

Who cites it

59 citing papers in PubMed, 4 syntheses or guidelines pooled it, 96 citations in OpenAlex.

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  17. Validation and normative data for the BAC app in Spanish-speaking individuals with psychosis and healthy controls.European psychiatry : the journal of the Association of European Psychiatrists · 2025
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

7 authors at 1 institution in 1 country.

Tesfa Dejenie HabtewoldDepartment of Epidemiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands. tesfadej2003@gmail.com.ORCID http://orcid.org/0000-0003-4476-518X
Lyan H RodijkDepartment of Epidemiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
Edith J LiemburgDepartment of Psychiatry, Rob Giel Research Center, University Medical Center Groningen, University Center for Psychiatry, University of Groningen, Groningen, The Netherlands.
Grigory SidorenkovDepartment of Epidemiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
H Marike BoezenDepartment of Epidemiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
Richard BruggemanDepartment of Psychiatry, Rob Giel Research Center, University Medical Center Groningen, University Center for Psychiatry, University of Groningen, Groningen, The Netherlands.
Behrooz Z AlizadehDepartment of Epidemiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands. b.z.alizadeh@umcg.nl.ORCID http://orcid.org/0000-0002-1415-8007
University Medical Center Groningen · NL

Funding

Universitair Medisch Centrum Groningen (University Medical Center Groningen) 616163
6 · The paper itself

Abstract

To tackle the phenotypic heterogeneity of schizophrenia, data-driven methods are often applied to identify subtypes of its symptoms and cognitive deficits. However, a systematic review on this topic is lacking. The objective of this review was to summarize the evidence obtained from longitudinal and cross-sectional data-driven studies in positive and negative symptoms and cognitive deficits in patients with schizophrenia spectrum disorders, their unaffected siblings and healthy controls or individuals from general population. Additionally, we aimed to highlight methodological gaps across studies and point out future directions to optimize the translatability of evidence from data-driven studies. A systematic review was performed through searching PsycINFO, PubMed, PsycTESTS, PsycARTICLES, SCOPUS, EMBASE and Web of Science electronic databases. Both longitudinal and cross-sectional studies published from 2008 to 2019, which reported at least two statistically derived clusters or trajectories were included. Two reviewers independently screened and extracted the data. In this review, 53 studies (19 longitudinal and 34 cross-sectional) that conducted among 17,822 patients, 8729 unaffected siblings and 5520 controls or general population were included. Most longitudinal studies found four trajectories that characterized by stability, progressive deterioration, relapsing and progressive amelioration of symptoms and cognitive function. Cross-sectional studies commonly identified three clusters with low, intermediate (mixed) and high psychotic symptoms and cognitive profiles. Moreover, identified subgroups were predicted by numerous genetic, sociodemographic and clinical factors. Our findings indicate that schizophrenia symptoms and cognitive deficits are heterogeneous, although methodological limitations across studies are observed. Identified clusters and trajectories along with their predictors may be used to base the implementation of personalized treatment and develop a risk prediction model for high-risk individuals with prodromal symptoms.

Indexed as

Cognition DisordersPsychotic DisordersSchizophreniaCognitionCross-Sectional StudiesHumans

Identifiers

PMID32694510
PMCPMC7374614
OpenAlexW3044510736

What OpenQuestion holds

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LicenceCC BY
Read underepoch 390

Registered trials

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.