Fig. 1From: Cost-effectiveness of CTA, MRA and DSA in patients with non-traumatic subarachnoid haemorrhageMarkov decision tree basic model showing exemplary branch for CTA. Branches for MRA and DSA not shown in detail. TP true-positive, FN false-negative, TN true-negative, FP false-positive test result. Example of absolute patient numbers from base case analysis in brackets. Input parameters derived from Table 1Back to article page