Document Detail

Erratum of When Wait Lists Are not Feasible, Nothing Is a Thing That Does not Need to Be Done.
MedLine Citation:
PMID:  20515215     Owner:  NLM     Status:  In-Data-Review    
Reports an error in When wait lists are not feasible, nothing is a thing that does not need to be done by Grant J. Devilly and Alexander C. McFarlane (Journal of Consulting and Clinical Psychology, 2009[Dec], Vol 77[6], 1159-1168). There is an error in the computation of Equation 4 (p. 1165): z does not equal -2.44 as reported but, instead, equals 1.73. We had not divided by the denominator ( radical2). This makes p(one-tailed)= .042, not .007 as reported. The interpretation of this computation does not change, although the level of probability does. Rather than being confident that the two studies are from different populations with a p level of .007, we are still likely to see these studies as having obtained significantly different results but at the probability level of p< .05. (The following abstract of the original article appeared in record 2009-22711-014) Clinical psychology practices initially grew through the use of case studies, uncontrolled trials, and eventually through randomized controlled trials (RCTs). The use of a wait-list control group is standard practice in such trials of treatment regimens for psychopathological conditions. However, as knowledge advances regarding the successful treatment of such conditions, best practice guidelines are being developed. These guidelines have predominantly been based on the results of RCTs and use aggregating mechanisms, such as meta-analysis, to derive their conclusions. The authors argue here for statistical methods that allow for comparisons to existing data from wait-list controls for which the continued use of wait-list conditions has become problematic. Using posttraumatic stress disorder (PTSD) as an example, this article proposes various methods for obviating the need for a wait-list control under such circumstances. After conducting separate meta-analyses for both treatment and control conditions, the authors found that wait-list conditions do provide some benefit to participants with PTSD, but current best practice treatment conditions elicit far superior effect sizes. The various methods for evaluating a study without a wait-list control are proposed and demonstrated. (PsycINFO Database Record (c) 2010 APA, all rights reserved).
Grant J Devilly; Alexander C McFarlane
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of consulting and clinical psychology     Volume:  78     ISSN:  1939-2117     ISO Abbreviation:  J Consult Clin Psychol     Publication Date:  2010 Jun 
Date Detail:
Created Date:  2010-06-02     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0136553     Medline TA:  J Consult Clin Psychol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  408     Citation Subset:  IM    
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