This retrospective register-based cohort study investigates the association between birth complications, intrauterine crowding, and the development of congenital muscular torticollis (CMT). CMT is characterized by the shortening and tightening of the sternocleidomastoid muscle, leading to abnormal head positioning. The study will analyze data from the Norwegian Medical Birth Registry (MFR) and the Norwegian Patient Registry (NPR) to determine whether individuals with CMT have a higher prevalence of birth complications or signs of intrauterine crowding compared to the general population. By identifying risk factors associated with CMT, this study aims to identify the possible etiology of CMT.
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Timeframe: Data from the time period of 1990 to 2023.