The illness rate of exposed groups is higher than that in no-exposed workers on dizzy giddy, headache, memory declining, catamenia disturbance, coryza, pharyngitis, dermatitis.

• 低浓度混苯接触组头晕、头痛、记忆力下降、月经紊乱以及鼻炎、咽炎、皮炎发病率明显高于对照组，发病者专业工龄无明显差异。