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A comment on New Zealand school tossed its playground rules. Parent comment

Re:New Zealand school tossed its playground rules by velik_m on Monday March 31, 2014 @01:35AM (#7499824)
That is 20% drop in injuries.

EDIT: it's actually a 25% increase as ebrenes correctly pointed out. Server me right for trying to do math early in the morning...

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Re:New Zealand school tossed its playground rules by ebrenes on Monday March 31, 2014 @02:31AM (#7499987)
No, it's not. That's one injury per population amount, so the lower the second number the less people you "need" to get one injury.

Assuming a fixed population size of 1 million, given the 1980 prevalence of injuries you'd expect about ~689 injuries. With the 2012 prevalence of injuries you'd expect about ~865 injuries. So it's actually an increase, not a drop.

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