Here is the design of a clinical trial:

Official Title: Postural Control Intervention With the Robotic Trunk-Support-Trainer (TruST) in Children With Cerebral Palsy: A Randomized Controlled Trial

Included conditions:
- Cerebral Palsy

Study Armgroups:
- {'label': 'Robotic Trunk-Support-Trainer (TruST)', 'type': 'EXPERIMENTAL', 'description': 'Postural-reaching control intervention with TruST', 'interventionNames': ['Device: Robotic Trunk-Support-Trainer (TruST)']}
- {'label': 'Static Trunk Support', 'type': 'ACTIVE_COMPARATOR', 'description': 'Postural-reaching control intervention with Rigid Trunk Support', 'interventionNames': ['Device: Static Trunk Support']}

Interventions:
- {'type': 'DEVICE', 'name': 'Robotic Trunk-Support-Trainer (TruST)', 'description': 'This will involve tailoring the level of postural assistance via force fields and systematically introduce postural task-progression across training sessions. Age-appropriate activities, including toys and games, will be used in training.\n\n- Twelve 2hr training sessions (3 times per week for 4 weeks)', 'armGroupLabels': ['Robotic Trunk-Support-Trainer (TruST)']}
- {'type': 'DEVICE', 'name': 'Static Trunk Support', 'description': 'This will involve static support for the trunk via a trained therapist. Age-appropriate activities, including toys and games, will be used in training.\n\n- Twelve 2hr training sessions (3 times per week for 4 weeks)', 'armGroupLabels': ['Static Trunk Support']}

Primary Outcomes:
- {'measure': 'Change in Modified Functional Reach Test (mFRT) after intervention', 'description': 'The mFRT measures proactive postural control during maximum reaching distance. It is a valid and reliable tool in CP; and it discriminates GMFCS levels.', 'timeFrame': 'Through study completion, an average of 4 months'}
- {'measure': 'Change in Postural Star-Sitting Test (PSST) after intervention', 'description': 'The PSST will be performed before and after interventions to monitor sitting control progression in both TruST- and control-intervention groups. The investigators have several motivations that rationalize this customized measurement. It: 1) is age-appropriate, 2) is goal-oriented, 3) directly measures sitting based on trunk control improvements, 4) is responsive to capture sitting workspace area increases, and 5) offers data with a straightforward functional interpretation.', 'timeFrame': 'Through study completion, an average of 4 months'}
- {'measure': 'Change in Box and Blocks Test (BBT) after intervention', 'description': 'The BBT examines manual dexterity. The child moves the maximum number of blocks (2.5cm2), one at a time, between the compartments of a partitioned box within 60s. B\\&B is sensitive to post-intervention changes with the more- and less-affected hand. Arm displacement and grasping will be analyzed with Datavyu. An instruction manual has been created to standardize video-coding procedures and define the reaching variables. Grasping will be defined from the moment the hand contacts the block to the time this is lifted from the surface. Arm displacement will be defined from end of grasping to block release. Reaching performance will be the summation of grasping and arm displacement. Two coders will be used to determine video-coding reliability.', 'timeFrame': 'Through study completion, an average of 4 months'}

Please estimate the sample size based on the assumption: 
power=0.8, two-tailed α rate=1% (p<0.005), mixed ANOVA
Sample size estimation
          We used preliminary data from our previous study and literature to estimate sample and effect sizes.16 25 For this purpose, G-Power (V.3.1.9.4., Dusseldorf University) and SPSS (V.25, IBM) were used. Our primary outcome was upper body balance during seated reaching (Pilot average=30Â° Â± SD=22Â°, partial Î·2=0.10, n=11). With a mixed analysis of variance (ANOVA), we estimated 68 subjects to achieve a power=0.8, considering a two-tailed Î± rate=1% (p<0.005). We will recruit an additional 20% of participants (82 participants in total) to account for potential group heterogeneity and dropouts.