Table 2

Risk of subarachnoid haemorrhage associated with vigorous physical activity using logistic regression and case cross over analyses

Logistic regression analysis
Case patients n=149Control subjects n=298Adjusted relative risk2-150
n%n%RR95% CI
Non-vigorous or no physical activity at reference time13892.6280941.0
Vigorous physical activity at reference time42.71.311.61.2–113.2
Case cross over analysis
No with vigorous activity <15 minutes before onset Relative risk2-151
No RR 95% CI
All cases149415.04.3–52.2
  • 2-150 Adjusted relative risk (RR) and 95% CIs were derived from conditional logistic regression, taking into account matching on age, sex, and respondent type and adjusting for hypertension status and long term regular physical activity during past year (kcal/week).

  • 2-151 RR and 95% CI of having a subarachnoid haemorrhage during a period of vigorous physical activity compared with a period of non-vigorous or no physical activity were derived from the Mantel-Haenszel estimate.