A and B, Decision analysis tree using 3 strategies for a hypothetical population of patients <19 years old with suspected shunt malfunction: CT, fsMRI, and POCUS, each depicted as square decision nodes. After the initial choice, an outcome is observed of chance events (circles). Each branch ends at a possible terminal node (triangles). Utilities are listed at each terminal node. fMRI, fast sequence magnetic resonance imaging.
ICER plot of imaging strategies. The CT-only strategy represents the baseline for comparison. Data were generated from 50 000 second-order simulations by using Monte Carlo simulation. Ovals around the data represent the boundary of an area encompassing 95% of data for a particular imaging strategy. WTP is plotted at both $50 000 and $100 000 per QALY.
Cost-effectiveness acceptability curve at various WTP thresholds. A cost-effective acceptability curve represents the percentage of iterations within the probabilistic sensitivity analysis (y-axis) plotted against the WTP threshold set at increasing values (x-axis). The WTP represents how much money a society is willing to pay for an increase in 1 QALY. The above graph demonstrates the cost-effectiveness acceptability curves for all 4 strategies.