From Onset and Prodromal Stage to a Life-Long Course of Schizophrenia and Its Symptom Dimensions: How Sex, Age, and Other Risk Factors Influence Incidence and Course of Illness.
Level 5 - mechanism / opinion, no new human data
Narrative review synthesizing epidemiological and longitudinal findings on schizophrenia without systematic review methodology.
PubMed 31139639 · doi:10.1155/2019/9804836
What was done
The author reviewed epidemiological and longitudinal data on schizophrenia, examining the prodromal phase, age- and sex-specific incidence patterns, symptom dimensions (positive, negative, depressive), and illness trajectories over long-term follow-up (up to 11.2 years post-first admission).
What was found
Schizophrenia incidence peaked at ages 15 to 25 in males. In females, incidence showed a bimodal pattern: a primary peak at 15 to 30 years and a second, flatter peak around menopause (44 to 49 years), with lifetime risk remaining comparable between sexes. In follow-up up to 11.2 years, the mean number of psychotic relapse episodes was 3 (range: 0 to 29). Positive symptom exacerbations had the shortest average duration (2 months), whereas depressive and negative symptom exacerbations lasted nearly 6 months on average. Overall symptom scores declined sharply after the first episode and plateaued by 5 years post-admission; negative symptoms reached a plateau after 2 to 3 years in females and 5 years in males. Depression emerged as the most frequent long-term symptom.
Why it matters
Recognizing the late-onset perimenopausal peak in women and the predominance of persistent depressive and negative symptoms challenges traditional views of schizophrenia as solely a disorder of young adulthood and highlights distinct sex-specific treatment windows.
Limits
The abstract does not report cohort sample sizes, specific inclusion criteria, or statistical variance/confidence intervals for the reported means. As a narrative review rather than a systematic review, study selection criteria and risk of bias assessments are not detailed.
Cited by
- supports A person's first psychotic episode typically occurs in late adolescence or early adulthood.