Case study: Body composition and bone changes following a thru-hike of the Pacific Crest Trail by a young female adult.

Attention-Deficit/ Hyperactivity Disorder (ADHD) is a neurodevelopmental disorder that commonly occurs in childhood and is characterized by persistent inattention, impulsivity and hyperactivity. Even in adulthood, these symptoms may continue to be observed, which brings many problems to patients in learning, work, life and so on. At the same time, the patient ‘s family will also suffer great mental and economic pressure. Therefore, it is critical to improve the prognosis of patients by accurately identifying the early symptoms of the disease and taking correct interventions. With the rapid development of digital new media, short-video platforms have gained tremendous popularity and become the main way for the public to obtain health information. Benefiting from massive active user groups and precise algorithmic dissemination mechanisms, an increasing number of users and medical practitioners share disease-related experience and popular science knowledge on Douyin, Bilibili, Xiaohongshu and other mainstream domestic short-video platforms. Nevertheless, a large number of unregulated self-published contents exist on these platforms, and misleading medical information will bring hidden risks to public health. In particular, inaccurate online content has been proven to greatly affect ADHD patients’ medical choices, treatment compliance and social cognition. Health content posted by non-professional creators tends to be less credible, a conclusion also confirmed by research on mainstream social platforms around the world: data show that about 30% to 40% of health-related videos on YouTube and TikTok contain false or misleading information. It is noteworthy that extant research on the online information of ADHD has focused primarily on international platforms (e.g., TikTok). In China, similar problems have also been observed in the research on the investigation of information quality of physical diseases (gastric cancer, inflammatory bowel disease, etc) on short-video platforms. Chinese users mainly rely on domestic social media to acquire health knowledge, and the content production, dissemination and acceptance modes present distinct local characteristics under China’s unique network environment, cultural atmosphere and information supervision system. Accordingly, research results obtained from foreign platforms cannot be directly applied to domestic situations. Most existing studies evaluate ADHD-related content using single or limited assessment tools, each of which only reflects a single dimension of content quality. Comprehensive evaluation of ADHD information therefore requires the combined use of multiple instruments. At present, there is still a lack of systematic empirical research evaluating the information quality of ADHD-related content on mainstream domestic short-video platforms.