Swimming pool drowning deaths in the USSelf-storage facilities in the US
It turns out that Americans have been solving the drowning problem by storing their children in climate-controlled units instead of taking them to the pool, which is either a breakthrough in preventative medicine or a catastrophic misunderstanding of what self-storage facilities are for. The correlation is so tight—negative 0.931, which is the kind of number that makes statisticians weep into their coffee—that one might reasonably conclude that every new Public Storage location that opens somewhere in Nebraska is directly preventing a child from slipping beneath the surface in Florida. We have apparently discovered that the way to keep Americans safe around water is to give them increasingly better places to store their bicycles.
What's actually happening here is probably less sinister and more mundane: both drowning rates and self-storage expansion are being pulled along by the same invisible hand, which is to say population shifts and economic cycles. From 2005 to 2021, Americans were gradually moving away from the Sunbelt (where pools are more common and drowning deaths consequently higher) and toward suburban regions where they accumulated enough stuff to require about 50,000 storage facilities nationwide—roughly one for every 6,500 people, a density that would have seemed outrageous to someone from 1985. Simultaneously, increased awareness of water safety, better swimming lessons through economic growth periods, and frankly the opioid crisis (which correlates with these drowning statistics more directly than anything else) were all quietly pushing those numbers downward at the same time self-storage was booming as a symptom of suburban sprawl and accumulated consumer goods.
The universe, it seems, occasionally arranges its coincidences with such precision that we can almost convince ourselves they mean something, when really they're just two separate things being shoved around by much larger forces we barely noticed. We are pattern-seeking creatures in a world where patterns sometimes emerge purely by accident, which is either comforting or terrifying depending on what you were hoping to believe about causality. Both trends simply stopped mattering equally.
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Want to learn more about why correlations like “Swimming pool drowning deaths in the US” vs “Self-storage facilities in the US” don't prove causation? Read our guide to statistical thinking.