Incidence of hospital referred head injuries in Norway: a population based survey from the Stavanger region.

Scand J Trauma Resusc Emerg Med · 2009 · PMC2650679 · PMID 19232086

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a clear trendno p-value reported

Interestingly, a clear trend towards reduced incidence is present, as the annual admission rates in these studies were 200, 236 and 169/100,000 population respectively.

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