Figure 1

Decision tree structure. The decision tree structure for QuantiFERON-TB Gold Plus (QuantiFERON) and the tuberculin skin test (TST). The four health states leaving the decision tree are (i) Healthy, (ii) Untreated latent tuberculosis infection (LTBI) (treatment Naïve), (iii) LTBI, taking treatment without adverse events and (iv) LTBI, taking treatment with adverse events.