The one thing that is often misunderstood by people about these reports is that they actually don't measure health--they measure risk. While it may seem like those are two sides of the same coin, it's not quite that simple. Risk is a measure of probabilities rather than possibilities. It is quite possible to have a high risk of injury without suffering an injury, just as it's possible to drive home with your eyes closed. While the measure of that risk is injury, a binary result of "is he injured or isn't he?", the actual measure of the success of our system is the prediction of injury over a population.

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