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Differential attrition rates in alcohol abusing and nonabusing schizophrenic inpatients: a methodological note
1University of Pennsylvania, Philadelphia.
Alcoholism, Clinical and Experimental Research
|August 1, 1992
Summary
Screening processes significantly affect study samples of schizophrenic patients. Nonabusing individuals experienced higher attrition, impacting research on substance use in schizophrenia.
Area of Science:
- Psychiatry
- Clinical Psychology
- Substance Abuse Research
Background:
- Schizophrenia often co-occurs with substance use disorders.
- Accurate sampling is crucial for understanding these comorbidities.
- Screening methods can introduce bias in patient selection.
Purpose of the Study:
- To examine how the screening process influences the final sample composition.
- To compare attrition rates between alcohol-abusing and non-abusing schizophrenic patients.
- To assess the implications of differential attrition on research findings.
Main Methods:
- Analysis of screening and enrollment data for hospitalized schizophrenic patients.
- Comparison of rejection, refusal, and completion rates between patient groups.
- Statistical evaluation of attrition differences.
Main Results:
- Nonabusing schizophrenic patients showed higher rates of staff rejections and refusals.
- Inappropriate subjects were more common in the nonabusing group.
- Study completer rates were lower among nonabusing schizophrenic individuals.
Conclusions:
- Differential attrition during screening significantly impacts sample representativeness.
- Findings highlight potential biases in studies of substance use in schizophrenia.
- Researchers must consider screening effects when interpreting results.