T lymphocyte subset test results for the two cohorts of children
| T lymphocyte subset | TD (n=135) | TD plus allergy (n=85) | t (t′*) | P value |
| CD3 | 62.1±8.7 | 65.4±7.8 | 2.8492 | 0.0048 |
| CD4 | 28.3±5.1 | 38.3±5.1 | 14.161 | 0.0000 |
| CD8 | 31.5±6.2 | 30.7±6.5 | 0.9146 | 0.3614 |
| CD4:CD8 | 0.8±0.1 | 1.3±0.3 | −14.855* | <0.05 |
*t 'test was used when the variance of two samples is not equal.
TD, tic disorder.