Outcome measures
running/jumping
Children had three testing sessions: at baseline, the week before intervention (T1), after intervention (T2), and at three months follow-up (T3). The primary outcome was the Assisting Hand Assessment [We collected accelerometer data to control the intensity of intervention in terms of upper extremity movement repetitions. As we had only two accelerometer devices, data were collected for one day for each child, with measures registered on two paired participants during the same day. Accelerometer data were never collected during the first and last days of camps, thus avoiding the potential biases due to novelty at start and unusual camp activities the last day. To further quantify the motor engagement time during the therapeutic intervention and to record the type of activities performed, interventionists systematically reported treatment content, defining the duration and type of activities for upper (gross/fine dexterity, card games, art and craft, functional/daily life activities) and lower (sitting on ball/bench, standing, balance board, walking, running/jumping, bicycle, scooter) extremities. Accelerometer data were collected using a wGT3X-BT monitor (Actigraph, Pensacola, Florida) worn on the wrist of the more-affected upper arm. Wear sensor analysis and manual reporting of treatment schedule were used for wear time validation. Acceleration data were recorded at 30 Hz, downloaded using ActiLife 6.13.4 software (Actigraph, Pensacola, Florida), resampled to 1 Hz, and converted to vector magnitude (VM; square root of the sum of the squares of each axis) activity counts. Activity counts provide an index of frequency (Hz) and intensity (m/s