We used the Ontario Stroke Registry and linked databases between 2003-2013 to identify patients who received DET after admission for acute stroke.  We defined ‘poor outcome’ as modified Rankin Scale (mRS) score 5 at discharge or death at 90 days, and ‘good outcome’ as mRS 0-3 at discharge and alive at 90 days.   We used multiple logistic regression to identify variables significantly associated with the outcomes and adjusted for age, sex, pre-admission independence, prior stroke, dementia, atrial fibrillation, vascular co-morbidities, stroke type, face/arm/leg weakness and severity, admission location, endotracheal intubation, tracheostomy, and timing of DET.  We derived a point score from the model beta coefficients, and measured model discrimination and calibration using c-statistic and Hosmer-Lemeshow test, respectively.  We used data from 2003-2008 for derivation and 2009-2013 for validation of the score.