Primary intracerebral and aneurysmal subarachnoid hemorrhage in Izumo City, Japan. Part 1: incidence and seasonal and diurnal variations

Abstract

The actual incidence rates of both primary ICH and aneurysmal SAH seem to be much higher than have been reported so far. In addition, the data indicate the existence of seasonal periodicity for men and younger patients with ICH, and that the risk of both ICH and SAH is lower during nighttime.