Randomization
Families were randomized in a 1:1:2 scheme to the parent support treatment group with (PGB) and without booster sessions (PGNB) and standard treatment (ST), enabling comparison between two groups, parent program (PGB, PGNB) and ST, and between three groups, PGB, PGNB and ST. To reduce possible bias, families and group leaders were blinded to booster/non-booster allocation until the 10-week ML program had finished. Randomization was conducted using an electronic randomization program with permuted blocks by the study statistician, who maintained the randomization list to ensure concealment. A priori power calculation for the 12-month study concluded that 75 children per group (parent program compared to ST) were needed to detect a difference in BMI-SDS of 0.3 (SD 0.5) with 85% power. See Ek et al. [