The primary efficacy variable was number of gout flares per participant per arm. Mean number of gout flares per treatment arm was derived from this primary variable. A gout flare was defined as an increase in participant-reported gout pain in the most affected joint during a gout attack. The target dose was defined as the minimum single dose that leads to at least the same expected efficacy as the expected efficacy of the comparator colchicine with respect to the mean number of gout flares. Four dose-response models (linear, linear in log-dose, logistic and emax) were chosen.