Ну я тебе выводы приведу, но вообще вся статься стоящая:

Parachute use to prevent death and major trauma related
to gravitational challenge: systematic review of
randomised controlled trials


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.

Но и твоя хороша!