Forest plot of the 10 studies which patients with DR were divided into PDR and NPDR groups.

Meta-analysis of the CRP level between the two groups. I2 (I2 = 57.3%) was larger than 50%, a random effects model was used. SMD, standardized mean difference; CI, confidence interval.针对两组C反应蛋白（CRP）水平的荟萃分析（Meta-analysis）。I²统计量（I2=57.3%）大于50%，故采用随机效应模型。标准化均数差（SMD, standardized mean difference）；置信区间（CI, confidence interval）。