No deep vein thrombosis (DVT) subtree showing possible outcomes without development of DVT. The tree shown is for strategy of anticoagulant prophylaxis. A linkage term representing the complement of the effectiveness of withholding anticoagulant prophylaxis for reducing the risk of progression of ICH progression was used to link the main subtrees. This effectiveness term was calculated as follows: effectiveness of withholding anticoagulant prophylaxis = ((probability of ICH progression with LMWH) - (probability of ICH progression without LMWH))/(probability of ICH progression with LMWH). The circles represent chance nodes, and the triangles on the far right represent the outcome measure, expected utility. Numerical values under each branch are the baseline probabilities used at each chance node for the baseline case and with administration of anticoagulant prophylaxis. Values to the right of each triangle are the final expected values (utility) for each state. Alive w Systemic Bleed: survival after a systemic bleeding complication; CNS Bleed: progression of intracranial hemorrhage; Disabling: disabling neurological deficit; DVT: deep vein thrombosis; Live CNS Bleed: survival after progression of intracranial hemorrhage; Non Disabling: non-disabling neurological deficit; No Sys Bleed: no systemic bleeding complication; Systemic Bleed: gastrointestinal bleeding.