There isn't clearly a control group here, but a cohort of 104 kids at the start (of whom seven were already receiving PB/GAH) reduced to 65 (of whom 57 were now

There isn't clearly a control group here, but a cohort of 104 kids at the start (of whom seven were already receiving PB/GAH) reduced to 65 (of whom 57 were now receiving PB/GAH) by the end, in twelve months. The supplementary materials explain this in good detail, but it doesn't make intuitive sense to me.