In a separate analysis, multivariate logistic regression will be performed to identify baseline characteristics that are independently associated with inadvertent fibrinolytic therapy among fibrinolysis recipients. A first-order interaction term involving prehospital fibrinolysis will be tested for statistical significance and, if appropriate, analysis will be stratified according to the receipt of prehospital versus hospital fibrinolysis. Then odds ratio will be estimated for each medical outcome associated with inadvertent fibrinolysis after adjusting for quintile of propensity score.