154 patients were divided into 3 groups that received, by randomized assignment, adalimumab every week, adalimumab every other week, or a placebo. Patients and doctors did not know which drug each patient received. After 16 weeks, all patients received adalimumab every other week, but if HS worsened, treatment reverted to every week. The total time in which patients were treated was up to 1 year.