TY - JOUR
T1 - Short- and long-term changes in symptom dimensions among patients with schizophrenia spectrum disorders and different durations of illness
T2 - A meta-analysis
AU - de Winter, Lars
AU - Vermeulen, Jentien M.
AU - Couwenbergh, Chrisje
AU - van Weeghel, Jaap
AU - Hasson-Ohayon, Ilanit
AU - Mulder, Cornelis L.
AU - Boonstra, Nynke
AU - Veling, Wim
AU - de Haan, Lieuwe
N1 - Publisher Copyright:
© 2023 The Authors
PY - 2023/8
Y1 - 2023/8
N2 - In schizophrenia spectrum disorders, improvement in symptoms varies between patients with short and long durations of illness. In this meta-analysis we provided an overview of both short- and long-term symptomatic improvement for patients with schizophrenia spectrum disorders with distinct durations of illness. We included 82 longitudinal studies assessing the course of positive, negative, depressive and disorganization symptoms. We analyzed effect sizes of change in four subgroups based on durations of illness at baseline: <2 years, 2–5 years, 5–10 years, >10 years. Potential moderators were explored using meta-regression and sensitivity analyses. Overall, we found large improvements of positive symptoms and small improvements of negative, depressive, and disorganization symptoms. Positive and disorganization symptoms improved relatively stronger for patients earlier in the course of illness, whereas negative and depressive symptoms showed modest improvement regardless of duration of illness. Improvement of symptoms was associated with higher baseline severity of positive symptoms, a younger age, a smaller subsample with schizophrenia, and, specifically for negative symptoms, higher baseline severity of depressive symptoms. Future research should focus on exploring ways to optimize improvement in negative and depressive symptoms for patients with schizophrenia spectrum disorders.
AB - In schizophrenia spectrum disorders, improvement in symptoms varies between patients with short and long durations of illness. In this meta-analysis we provided an overview of both short- and long-term symptomatic improvement for patients with schizophrenia spectrum disorders with distinct durations of illness. We included 82 longitudinal studies assessing the course of positive, negative, depressive and disorganization symptoms. We analyzed effect sizes of change in four subgroups based on durations of illness at baseline: <2 years, 2–5 years, 5–10 years, >10 years. Potential moderators were explored using meta-regression and sensitivity analyses. Overall, we found large improvements of positive symptoms and small improvements of negative, depressive, and disorganization symptoms. Positive and disorganization symptoms improved relatively stronger for patients earlier in the course of illness, whereas negative and depressive symptoms showed modest improvement regardless of duration of illness. Improvement of symptoms was associated with higher baseline severity of positive symptoms, a younger age, a smaller subsample with schizophrenia, and, specifically for negative symptoms, higher baseline severity of depressive symptoms. Future research should focus on exploring ways to optimize improvement in negative and depressive symptoms for patients with schizophrenia spectrum disorders.
KW - Course
KW - Epidemiology
KW - Longitudinal
KW - Meta-analysis
KW - Psychosis
KW - Schizophrenia spectrum disorders
KW - Symptoms
UR - http://www.scopus.com/inward/record.url?scp=85164416813&partnerID=8YFLogxK
U2 - 10.1016/j.jpsychires.2023.06.031
DO - 10.1016/j.jpsychires.2023.06.031
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C2 - 37429186
AN - SCOPUS:85164416813
SN - 0022-3956
VL - 164
SP - 416
EP - 439
JO - Journal of Psychiatric Research
JF - Journal of Psychiatric Research
ER -