Cognitive dysfunction after concussion

BMJ 1998;316:865 ( 14 March )

Letters

Cognitive dysfunction after concussion

Authors did not to comment on the single truly significant result

Authors' reply

Authors did not to comment on the single truly significant result

The first 150 words of the full text of this article appear below.

EDITOR $---$ Teasdale and Engberg examined the duration of cognitive dysfunction after concussive head injury in young men.¹We are concerned about their interpretation of some of the datapresented. The observation that cognitive function was impairedup to one week after head injury was based on examination of onlyeight subjects, four of whom showed impaired performance. Theauthors placed considerable weight on this result even thoughthe relative risk of cognitive impairment in the subjects withhead injury was not significant by conventional criteria. It wasadditionally perplexing, given this non-significant result, thatthe 95% confidence interval did not pass through unity. Perhapsmost surprising of all was that the authors failed to commenton the one truly significant result in that section of the paper $---$ thatimpaired cognitive performance was shown in those subjects testedmore than 200 days after the head injury.

The other main finding, that . . . [Full text of this article]

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Duration of cognitive dysfunction after concussion, and cognitive dysfunction as a risk factor: a population study of young men: Thomas W Teasdale and Aase Engberg
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