A reply this comment asked: "Do you believe parachutes do anything useful when jumping out of a plane? Do you have a double blind study that proves it?" A rand

A reply this comment asked: "Do you believe parachutes do anything useful when jumping out of a plane? Do you have a double blind study that proves it?" A randomised controlled trial: https://www.bmj.com/content/363/bmj.k5094 https://www.bmj.com/content/363/bmj.k5094 Parachute use did not reduce death or major traumatic injury when jumping from aircraft in the first randomized evaluation of this intervention. However, the trial was only able to enroll participants on small stationary aircraft on the ground, suggesting cautious extrapolation to high altitude jumps.