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Four of the 149 (2.7%) case patients were engaged in vigorous physical activity at the time of their subarachnoid haemorrhage. With those who were engaged in non-vigorous or no physical activity serving as the reference group, the relative risk of sustaining a subarachnoid haemorrhage for those engaged in vigorous physical activity was 11.6 (95% confidence interval (95% CI) 1.2-113.2). In the case cross over analysis, the relative risk was 15.0 (95% CI, 4.3-52.2). Higher levels of long te rm regular physical activity over the past year were associated with a lower, but not statistically significant, risk of subarachnoid haemorrhage (test for trend, p=0.3). The risk of subarachnoid haemorrhage is increased during vigorous physical activity , although only a few result from this mechanism. |
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