Smith and Pell report the results of a review and meta-analysis  
of randomized controlled trials of parachute use.

>From the Discussion:

"It is a truth universally acknowledged that a medical 
intervention justified by observational data must be in want of 
verification through a randomized controlled trial".

See:

http://www.bmj.com/cgi/content/full/327/7429/1459#responses

Smith, C., & Pell, J. (2003). Hazardous journey: Parachute use 
to prevent death and major trauma related to gravitational 
challenge: systematic review of randomised controlled trials. 
BMJ  2003;327:1459-1461.


Stephen
--------------------------------------------
Stephen L. Black, Ph.D.          
Professor of Psychology, Emeritus   
Bishop's University               
e-mail:  sblack at ubishops.ca
2600 College St.
Sherbrooke QC  J1M 1Z7
Canada
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