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Previous Volume 341:370-372 July 29, 1999 Number 5 Next

	Since this article has no abstract, we have provided an extract of the first 100 words of the full text and any section headings.

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To the Editor: Mortensen et al. (Feb. 25 issue)¹ acknowledge that a family history of schizophrenia is the best-established risk factor for the disorder but suggest that environmental factors, including the place and season of birth, are major determinants. This argument is based on estimates of the population attributable risk regarding factors found to be associated with schizophrenia in their population-based cohort. Unfortunately, their assertions about the relative importance of various risk factors overlook the fact that the calculation of population attributable risk is dependent on the frequency of the risk factor in a population. The calculation of relative risk, . . . [Full Text of this Article]

References

This article has been cited by other articles:

• PEDERSEN, C. B., MORTENSEN, P. B. (2001). Family history, place and season of birth as risk factors for schizophrenia in Denmark: a replication and reanalysis. Br. J. Psychiatry 179: 46-52 [Abstract] [Full Text]