Figure 2  .

Sensitivity analysis: cost per quality adjusted life year (QALY) gained by antibiotic prophylaxis as a function of the risk of bacterial arthritis for infections (prophylactic cost $60) and invasive medical procedures (prophylactic cost $12). For some of the risk situations presented in table 4, the risk of bacterial arthritis lies within the depicted range. These risk situations are represented as dots. For example, the risk of bacterial arthritis for patients with low susceptibility to bacterial arthritis (SI = 0) was 0.03% in the case of dermal infection (see table 4). For this risk situation, antibiotic prophylaxis costs $52 000 per QALY gained by prophylaxis (see table 5).