The trial is essentially a joke. Here's some more context: > participants included in the study were on aircraft at significantly lower altitude (mean of 0.6 m

The trial is essentially a joke. Here's some more context: > participants included in the study were on aircraft at significantly lower altitude (mean of 0.6 m for participants v mean of 9146 m for non-participants; P<0.001) and lower velocity (mean of 0 km/h v mean of 800 km/h; P<0.001). So essentially they had people jump about 2 feet from an airplane sitting at rest. Of course there were no injuries, and that was the point. Few people will participate in a trial in which the control group could die, and such a trial would be highly unethical.