A new study proves parachutes are useless
A new study flies in the face of anecdotal evidence and raises questions about how we read data.
- Scientists working at medical schools across the United States discovered that parachutes don't lower the death rate of people jumping out of airplanes.
- The study flies in the face of decades of anecdotal evidence.
- The findings should be carefully applied, due to "minor caveats" with the experimental structure.
There is an old joke that says "If your parachute doesn't deploy, don't worry: you have the rest of your life to fix it." The findings of a new study may put that joke out of fashion, as intrepid scientists found that jumping out of a plane with a parachute didn't lower the death rate of test subjects compared to those who jumped without one.
A leap of faith in anecdotal evidence
The study, published in the light-hearted Christmas edition of BMJ, involved 23 test subjects who were randomly sorted into two groups. One would leap out of an airplane with a parachute while the second would do the same with a regular old backpack. Their survival rates were then compared after they hit the ground. Shockingly, it was found that the rates were the same for both groups!
The authors explained that "Our groundbreaking study found no statistically significant difference in the primary outcome between the treatment and control arms. Our findings should give momentary pause to experts who advocate for routine use of parachutes for jumps from aircraft in recreational or military settings."
Yeh et al.
A portion of the flow chart explaining the study structure. As you can see, it follows every regulation for a randomized trial with a control group.
In order to get people to agree to take part in the study, the scientists had to structure the experiment properly. The airplane was both on the ground and stationary, as they thought it would be impossible to get people to agree to leap from a moving plane several thousand feet up without a parachute. The authors admit this was a "minor caveat" in the study's design.
They don't admit this until the fourth or fifth paragraph into the paper, however, which leads to their larger point.
Beware of headlines
The authors explain that the whole study was designed to highlight the limitations of randomized trials and the dangers of not reading past the first paragraph of a study. They explain:
"The parachute trial satirically highlights some of the limitations of randomized controlled trials. Nevertheless, we believe that such trials remain the gold standard for the evaluation of most new treatments. The parachute trial does suggest, however, that their accurate interpretation requires more than a cursory reading of the abstract. Rather, interpretation requires a complete and critical appraisal of the study. In addition, our study highlights that studies evaluating devices that are already entrenched in clinical practice face the particularly difficult task of ensuring that patients with the greatest expected benefit from treatment are included during enrollment."
While this study is funny, the questions it raises are real ones. Many influential studies in psychology have been found to be flawed because they used W.E.I.R.D test subjects or were applicable only to a limited range of situations. By clearly showing how accepted procedures can be used to create an absurd little paper, the authors remind us to look closely at the findings of any study.
Admit it, you've read a headline before and then pretended like you read the whole article later when you wanted to talk about it. The point of this silly study is to show just how misleading a summation of a study can be and how important context is in understanding what experiments mean. So have a laugh, and remember to always read more than the study's abstract before you decide to take its supposed findings to heart.
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Can sensitive coral reefs survive another human generation?
- Coral reefs may not be able to survive another human decade because of the environmental stress we have placed on them, says author David Wallace-Wells. He posits that without meaningful changes to policies, the trend of them dying out, even in light of recent advances, will continue.
- The World Wildlife Fund says that 60 percent of all vertebrate mammals have died since just 1970. On top of this, recent studies suggest that insect populations may have fallen by as much as 75 percent over the last few decades.
- If it were not for our oceans, the planet would probably be already several degrees warmer than it is today due to the emissions we've expelled into the atmosphere.
Research has shown that men today have less testosterone than they used to. What's happening?
- Several studies have confirmed that testosterone counts in men are lower than what they used to be just a few decades ago.
- While most men still have perfectly healthy testosterone levels, its reduction puts men at risk for many negative health outcomes.
- The cause of this drop in testosterone isn't entirely clear, but evidence suggests that it is a multifaceted result of modern, industrialized life.
Michael Dowling, Northwell Health's CEO, believes we're entering the age of smart medicine.
- The United States health care system has much room for improvement, and big tech may be laying the foundation for those improvements.
- Technological progress in medicine is coming from two fronts: medical technology and information technology.
- As information technology develops, patients will become active participants in their health care, and value-based care may become a reality.
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