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Updated: Aug 10, 2026

A Strategy to Identify de Novo Mutations in Common Disorders such as Autism and Schizophrenia
Published on: June 15, 2011
Insights
Married individuals are not more prone to schizophrenia hospitalization due to causation. Instead, selection and differential utilization factors explain this association, particularly in urban settings.
Area of Science:
- Psychiatry
- Sociology
- Epidemiology
Background:
- The association between marital status and schizophrenia hospitalization is a well-documented phenomenon.
- Existing research presents three primary hypotheses to explain this association: causation, selection, and differential utilization.
Purpose of the Study:
- To critically review the finding that married persons are more likely to be hospitalized schizophrenics.
- To differentiate between causation, selection, and differential utilization hypotheses using empirical data.
- To investigate the influence of geographic location (urban vs. rural) on these factors.
Main Methods:
- A strategy was devised to disentangle the three hypotheses by analyzing admission rates and hospitalization durations.
- The widowed category was specifically examined to isolate the effects of marital status.
- Data from the Maryland Psychiatric Case Register were utilized for hypothesis testing.
Main Results:
- The study found evidence supporting the selection and differential utilization hypotheses.
- No evidence was found to support the causation hypothesis.
- Selection effects were observed to be less pronounced in rural areas compared to urban areas.
Conclusions:
- The higher hospitalization rates for schizophrenia among married individuals are not attributable to a causal link.
- Selection processes and differential healthcare utilization patterns are key factors influencing this observed association.
- The impact of selection on marital status and schizophrenia hospitalization is moderated by geographic location, being weaker in rural settings.
Abstract:
The finding that married persons are more likely to be hospitalized schizophrenics is reviewed. Three interpretations of the finding are discussed: causation, selection, and differential utilization. A strategy to separate the three hypotheses is presented which uses data on rates of admission and duration of hospitalization and which concentrates on the widowed category. Data from the Maryland Psychiatric Case Register are used to test the hypotheses. Evidence of selection and differential utilization is found, but none in favor of the causation hypothesis. It is shown that selection operates less powerfully in rural areas.
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