Table 2.

The comparison of serum IL-4 before and after treatments among three groups ($\overline{x}\pm s$, pg/ml)

Group	n	Before treatment	After treatment
I	20	5.8 ± 2.1	12.2 ± 3.1**
II	20	6.1 ± 2.1	16.2 ± 4.1**
III	20	5.5 ± 4.1	8.2±2.3*

Compared to the level before treatment with group: * P < 0.05; Compared to Group III after treatment: ** P < 0.05