NSAA NON-Interventional Study Protocol

Inclusion Criteria

• •1. Evidence of a signed and dated informed consent document indicating that the participant's legally authorized representative (LAR) has been informed of all pertinent aspects of the study, along with evidence of age-appropriate child assent.
• •2. Confirmed diagnosis of DMD
• •3. Participant with DMD aged 4 to12 (inclusive) at t Enrollment date
• •4. Participant with DMD is ambulatory without assistive devices, braces, or aids throughout the study
• •5. Caregiver has access to and/or willingness to learn use of a smart phone and the iTC study mobile application
• •6. Participant and caregiver are based in the US throughout study
• •7. Participant and caregiver are fluent in the English language (verbally and in writing)