Serum 25-hyroxyvitamin D levels and tic severity in Chinese children with tic disorders

Tic disorders are a group of neurodevelopmental disorders that are characterized by non-rhythmic, stereotyped movements and/or vocalizations due to the sudden and involuntary contractions of one or more muscles (Sanger et al., 2010). Tic disorders have a typical age of onset between 3 and 8 years of age, with maximal tic severity commonly occurring between 8 and 12 years of age (Leckman et al., 1998). According to the Diagnostic and Statistical Manual of mental disorders - fifth edition (DSM-5) of American Psychiatric Association (2013), tic disorders have been divided into the following groups: Tourette's syndrome (TS), chronic motor or vocal tic disorder, provisional tic disorder, other specified and unspecified tic disorders.

Source: Psychiatry Research - May 31, 2018 Category: Psychiatry Authors: Hong-Hua Li, Ling Shan, Bing Wang, Lin Du, Zhi-Da Xu, Fei-Yong Jia Source Type: research