PMC

Flow diagram of the selection process of the studies included in the meta-analyses. Please see Section 2 for additional details.

Forest plot for meta-analysis of the association of -374T/A with diabetic retinopathy. Each study is represented by a square whose area is proportional to the weight of the study. The overall effect from meta-analysis is represented by a diamond whose width represents the 95% CI for the estimated OR. CI = confidence interval, OR = odds ratio.

Forest plot for meta-analysis of the association of -429T/C with diabetic retinopathy. Each study is represented by a square whose area is proportional to the weight of the study. The overall effect from meta-analysis is represented by a diamond whose width represents the 95% CI for the estimated OR. CI = confidence interval, OR = odds ratio.

Forest plot for meta-analysis of the association of Gly82Ser with diabetic retinopathy. Each study is represented by a square whose area is proportional to the weight of the study. The overall effect from meta-analysis is represented by a diamond whose width represents the 95% CI for the estimated OR. CI = confidence interval, OR = odds ratio.

Funnel plots for meta-analysis of the association of -429T/C, -374T/A, Gly82Ser, and 1704G/A with diabetic retinopathy. The x-axis is the standard error of the log-transformed OR (log OR), and the y-axis is the log-transformed OR. The horizontal line represents the overall estimated log-transformed OR. The 2 diagonal lines represent the pseudo 95% confidence limits of the effect estimate. (A) -429T/C; (B) -374T/A; (C) Gly82Ser; and (D) 1704G/A. OR = odds ratio.