After adjusting for possible confounding factors,CD4 and CD8 levels were positively related to CIN risk (the 1st versus 4th quartile CD4,CD8 OR = 0.45[0.34, 0.60] and 0.34[0.26, 0.45] for CIN1, 0.32 [0.21, 0.48] and 0.24 [0.16, 0.38] for CIN2/3). Here, CD4 is linked to cervical squamous intraepithelial neoplasia.