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oai:riubu.ubu.es:10259/82182023-12-19T01:05:13Zcom_10259_4839com_10259_5086com_10259_2604com_10259_4141com_10259_4415com_10259_3989com_10259.4_106col_10259_4840col_10259_4142col_10259_4416

00925njm 22002777a 4500 dc Cubo Delgado, Esther author Trejo Gabriel y Galán, José Mª author Ausín Villaverde, Vanesa author Sáez Velasco, Sara author Delgado Benito, Vanesa author Macarrón Vicente, Jesus author Cordero Guevara, José author Louis, Elan D. author Benito-León, Julián author 2011-08 Tic disorders constitute a neurodevelopmental disorder of childhood. This study sought to determine the prevalence of tic disorders in a school-based sample. A randomized sample of 1158 schoolchildren, based on clusters (classrooms) in the province of Burgos (Spain), was identified on a stratified sampling frame combining types of educational center and setting (mainstream schools and special education), using a two-phase approach (screening and diagnosis ascertainment by a neurologist). Tics with/without impairment criterion were diagnosed according to Diagnostic and Statistical Manual of Mental Disorders criteria. In mainstream schools, tics were observed in 125/741 students (16.86%; 95% confidence interval, 14.10-19.63), and were more frequent in boys (87/448, 19.42%; 95% confidence interval, 15.64-23.19) compared with girls (38/293, 12.96%; 95% confidence interval, 8.95-16.98; P = 0.03). In special education centers, tics disorders were observed in 11/54 of children (20.37%; 95% confidence interval, 8.70-32.03). Overall, tics with impairment criteria were less frequent than tics without impairment criteria (4.65% vs 11.85%, P < 0.0001). The most frequent diagnoses involved chronic motor tics (6.07%) and Tourette syndrome (5.26%). Tic disorders are common in childhood, and the use or nonuse of impairment criteria exerts a significant impact on tic prevalence estimates. 0887-8994 http://hdl.handle.net/10259/8218 10.1016/j.pediatrneurol.2011.03.003 Prevalence of Tics in Schoolchildren in Central Spain: A Population-Based Study