Parachute use to prevent death and major trauma related to gravitational challenge: systematic review of randomised controlled trialsBMJ 2003;327:1459-1461 (20 December)
Objectives To determine whether parachutes are effective in preventing major trauma related to gravitational challenge.
Design Systematic review of randomised controlled trials.
Data sources: Medline, Web of Science, Embase, and the Cochrane Library databases; appropriate internet sites and citation lists.
Study selection: Studies showing the effects of using a parachute during free fall.
Main outcome measure Death or major trauma, defined as an injury severity score > 15.
Results We were unable to identify any randomised controlled trials of parachute intervention.Conclusions As with many interventions intended to prevent ill health, the effectiveness of parachutes has not been subjected to rigorous evaluation by using randomised controlled trials. Advocates of evidence based medicine have criticised the adoption of interventions evaluated by using only observational data. We think that everyone might benefit if the most radical protagonists of evidence based medicine organised and participated in a double blind, randomised, placebo controlled, crossover trial of the parachute
Penso que só existem estudos retrospectivos, ou "case reports" que demonstram a utilidade dos pára-quedas para prevenir trauma grave em situações de "desafio gravitacional". Isso representa um nível 4 de evidência não é verdade?