Publication Bias and Psychotherapy
Last registered on November 10, 2017

Pre-Trial

Trial Information
General Information
Title
Publication Bias and Psychotherapy
RCT ID
AEARCTR-0002574
Initial registration date
November 08, 2017
Last updated
November 10, 2017 12:56 PM EST
Location(s)

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Primary Investigator
Affiliation
Princeton Unviersity
Other Primary Investigator(s)
PI Affiliation
Vrije Universiteit Amsterdam
Additional Trial Information
Status
In development
Start date
2017-11-08
End date
2018-01-02
Secondary IDs
Abstract
A meta-analysis of randomized control trials (RCTs) which investigate the effectiveness of psychotherapies for treating depression. We will analyze a database of psychotherapy RCTs using a set of techniques to test for and correct for publication bias, estimate power, and calculate pre- and post-experimental odds.
External Link(s)
Registration Citation
Citation
Cuijpers, Pim and Johannes Haushofer. 2017. "Publication Bias and Psychotherapy." AEA RCT Registry. November 10. https://www.socialscienceregistry.org/trials/2574/history/23150
Experimental Details
Interventions
Intervention(s)
This study is a meta-analysis. We will examine a large database of RCTs which study various psychotherapy, mostly variants of cognitive-behavioral therapy, to treat major depressive disorder.
Intervention Start Date
2018-01-01
Intervention End Date
2018-01-02
Primary Outcomes
Primary Outcomes (end points)
Major depressive disorder
Primary Outcomes (explanation)
Extant RCTs in our database measure depression in different ways. Most commonly, a psychological inventory such as the Hamilton Depression Rating Scale (HDRS) or Center for Epidemiological Studies Depression (CESD) scale is used and participants are diagnosed according to predefined criteria established by national psychiatric bodies. The mean differences between treatment arms in each study have been converted to standard deviations of the outcome variable to allow for comparison and aggregation.
Secondary Outcomes
Secondary Outcomes (end points)
Secondary Outcomes (explanation)
Experimental Design
Experimental Design
Meta-analysis. See the attached pre-analysis plan for more detail.
Experimental Design Details
Not available
Randomization Method
Computer randomization is the standard among RCTs included.
Randomization Unit
RCTs vary in their unit of randomization. Our unit of analysis is the trail.
Was the treatment clustered?
No
Experiment Characteristics
Sample size: planned number of clusters
N/A
Sample size: planned number of observations
331
Sample size (or number of clusters) by treatment arms
N/A
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
N/A. See pre-analysis plan for more information.
IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Name
IRB Approval Date
IRB Approval Number
Analysis Plan
Analysis Plan Documents
PAN_PAP_2017-11-08_dm.pdf

MD5: 47fe8389a94ae5ca4ea4e23f1f51c36b

SHA1: 704bc48d611fa6c735dcfcd42e3bb1b48ddc4420

Uploaded At: November 10, 2017