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.
- BMJ study — Parachutes don't save people who fall out of planes ›
- Can a Parachute Save Your Life? Not According to Science. ›
- Study Shows Parachutes Are Totally Worthless ›
What can 3D printing do for medicine? The "sky is the limit," says Northwell Health researcher Dr. Todd Goldstein.
- Medical professionals are currently using 3D printers to create prosthetics and patient-specific organ models that doctors can use to prepare for surgery.
- Eventually, scientists hope to print patient-specific organs that can be transplanted safely into the human body.
- Northwell Health, New York State's largest health care provider, is pioneering 3D printing in medicine in three key ways.
An ordained Lama in a Tibetan Buddhist lineage, Lama Rod grew up a queer, black male within the black Christian church in the American south. Navigating all of these intersecting, evolving identities has led him to a life's work based on compassion for self and others.
- "What I'm interested in is deep, systematic change. What I understand now is that real change doesn't happen until change on the inside begins to happen."
- "Masculinity is not inherently toxic. Patriarchy is toxic. We have to let that energy go so we can stop forcing other people to do emotional labor for us."
We were gaining three IQ points per decade for many, many years. Now, that's going backward. Could this explain some of our choices lately?
There's a new study out of Norway that indicates our—well, technically, their—IQs are shrinking, to the tune of about seven IQ points per generation.
Here's why generalists triumph over specialists in the new era of innovation.
- Since the explosion of the knowledge economy in the 1990s, generalist inventors have been making larger and more important contributions than specialists.
- One theory is that the rise of rapid communication technologies allowed the information created by specialists to be rapidly disseminated, meaning generalists can combine information across disciplines to invent something new.
- Here, David Epstein explains how Nintendo's Game Boy was a case of "lateral thinking with withered technology." He also relays the findings of a fascinating study that found the common factor of success among comic book authors.
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