Characteristics of the 68 patients included in the study.

Abbreviations: PDR, proliferative diabetic retinopathy; SD, standard deviation; VEGF, vascular endothelial growth factor; CTGF, connective tissue growth factor.缩略语说明：PDR：增殖性糖尿病视网膜病变（proliferative diabetic retinopathy）；SD：标准差（standard deviation）；VEGF：血管内皮生长因子（vascular endothelial growth factor）；CTGF：结缔组织生长因子（connective tissue growth factor）。