Adolescent Adult Age Factors Aged Aged, 80 and over Chi-Square Distribution England--epidemiology Female Fibrinolytic Agents--adverse effects Health Services Accessibility Humans Logistic Models Male Medical Audit Middle Aged Multivariate Analysis Odds Ratio Outcome and Process Assessment, Health Care Patient Selection Practice Patterns, Physicians' Quality Improvement Recombinant Proteins--therapeutic use Risk Factors Stroke--drug therapy Thrombolytic Therapy--adverse effects Time Factors Tissue Plasminogen Activator--adverse effects Treatment Outcome Young Adult