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We found marked seasonal variation in incidence,with the highest value (23%)observed in November-December and the lowest(10%)in July-August. Seasonal variations in incidence of cerebral hemorrhage were shown to be correlated not only with the inverse of ambient temperature,but also with the inverse of hours of sunshine and with ambient humidity.We found no difference between hypertensive and normotensive patients.Conclusions:Our study fails to bear out the hypothesis that the higher incidence of cerebral hemorrhage in late autumn and winter is due to the influence of low ambient temperature on blood pressure. |
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