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Internal and external validity in two studies that compared treatment methods.

J A Gliner1

  • 1Department of Occupational Therapy, Colorado State University, Fort Collins 80523.

The American Journal of Occupational Therapy : Official Publication of the American Occupational Therapy Association
|June 1, 1989
PubMed
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Comparing occupational therapy treatments is valuable, but methodological flaws can limit conclusions. Both studies showed improvement, but lacked control groups, preventing definitive effectiveness comparisons.

Area of Science:

  • Occupational therapy research methodology
  • Evidence-based practice in rehabilitation

Background:

  • Evaluating treatment effectiveness is crucial in occupational therapy.
  • Methodological rigor, including internal and external validity, is essential for drawing sound conclusions.
  • Previous studies often face challenges in establishing definitive treatment efficacy.

Purpose of the Study:

  • To critically evaluate two occupational therapy studies based on principles of internal and external validity.
  • To assess the methodological strengths and weaknesses of between-groups experimental designs in treatment comparison research.
  • To determine if the studies provided sufficient evidence to conclude the equal effectiveness of the compared treatments.

Main Methods:

  • Analysis of two published occupational therapy studies using between-groups experimental methodology.

Related Experiment Videos

  • Assessment of each study against established criteria for internal and external validity.
  • Distinction between a truly experimental design and a quasi-experimental design.

    • Main Results:

    • Both evaluated studies demonstrated improvement in treatment groups.
    • No statistically significant differences were found between the effectiveness of the two treatments in either study.
    • Both studies were limited by the absence of a true control group, impacting the validity of their conclusions.

    Conclusions:

    • The methodological limitations, particularly the lack of a true control group, restrict definitive conclusions about the equal effectiveness of the treatments.
    • While both treatments appeared to yield positive outcomes, the studies could not conclusively prove they worked equally well.
    • Future occupational therapy research should prioritize robust control groups to enhance the validity of treatment comparison findings.