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Study Designs in Epidemiology01:20

Study Designs in Epidemiology

Epidemiological study designs are fundamental tools for investigating the distribution, determinants, and control of health conditions in populations. They help researchers understand the relationships between exposures and outcomes, and they broadly fall into two categories: "observational" and "experimental" studies.
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Simple randomization
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Related Experiment Video

Updated: May 13, 2026

Design and Implementation of an fMRI Study Examining Thought Suppression in Young Women with, and At-risk, for Depression
08:42

Design and Implementation of an fMRI Study Examining Thought Suppression in Young Women with, and At-risk, for Depression

Published on: May 19, 2015

The Y-Worri Project: study protocol for a randomised controlled trial.

Alison L Calear1, Helen Christensen, Kathleen M Griffiths

  • 1Centre for Mental Health Research, The Australian National University, Canberra, Australia. Alison.Calear@anu.edu.au

Trials
|March 20, 2013
PubMed
Summary
This summary is machine-generated.

This study tested an internet-based anxiety prevention program for adolescents in Australian schools. Results will inform effective delivery methods for youth mental health initiatives.

Related Experiment Videos

Last Updated: May 13, 2026

Design and Implementation of an fMRI Study Examining Thought Suppression in Young Women with, and At-risk, for Depression
08:42

Design and Implementation of an fMRI Study Examining Thought Suppression in Young Women with, and At-risk, for Depression

Published on: May 19, 2015

Area of Science:

  • Adolescent mental health
  • School-based interventions
  • Anxiety prevention

Background:

  • Anxiety disorders are prevalent in adolescents, necessitating school-based prevention.
  • Effective delivery methods for school-based anxiety programs are not well-established.
  • This study addresses the need for evidence-based anxiety interventions in schools.

Purpose of the Study:

  • To evaluate the effectiveness of an internet-based anxiety prevention program.
  • To compare two implementation strategies for the program within schools.
  • To establish a scalable model for delivering mental health support to adolescents.

Main Methods:

  • A three-arm cluster randomised controlled trial involving 30 Australian schools.
  • Participants (14-18 years) were assigned to a wait-list control or one of two intervention groups.
  • The intervention involved a 6-week internet program (e-couch) delivered during class, supervised by teachers or teachers and youth mental health officers.

Main Results:

  • Primary outcome: reduction in generalised anxiety symptoms.
  • Secondary outcomes: improvements in depression, social anxiety, and anxiety sensitivity.
  • Data collected at baseline, post-intervention, and 6/12-month follow-ups.

Conclusions:

  • An effective school-based anxiety intervention could establish a new service delivery model.
  • This model could significantly improve adolescent mental health in Australia.
  • Successful implementation may reduce reliance on clinical services for youth mental health issues.