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Comparative analysis of serum total IgE levels in children aged 6 to 9 years with tic disorder and normal children. The median and interquartile range of total IgE level of 72 children in TD group were 42 (IQR: 20.25 ~ 117.75), and the median and interquartile range of total IgE level of 31 children in normal group were 6 ( IQR: 3 ~ 11). Mann-Whitney U test was used for the data of two groups, Z=-5.309, P < 0.001, the difference was statistically significant
