The most common reason for a trip to the emergency room is injury related to stairs and flooring—except for in September, when it’s football.

MarketWatch staffer Jessica Marmor Shaw takes a look at the top line findings in data from the National Electronic Injury Surveillance System (NEISS), which is maintained by the U.S. Consumer Product Safety Commission. Shaw notes that in 2014, there were an estimated 1.14 million visits to U.S. emergency rooms in which steps or stairs played a role in the injury. She writes:

IThe second most common reason, and only lagging by about 4,000 visits, is an injury related to floors or flooring materials — slipping on that freshly mopped linoleum or tripping over that uneven patch of tile, for example.

The NEISS data track only injuries where a consumer product, sport or recreational activity is involved. Visits related to chronic diseases, illegal drugs, medical devices or, crucially, automobiles aren’t counted (though it does count visits in which another product is involved along with an auto, for instance, a bicyclist getting struck by a car).

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