Figure 2

Summary risk ratios for colorectal cancer, the highest compared to lowest FPG category.
Considering that the doses of the comparison groups were quite different, we divided the meta-analysis of two-category variables into two parts according to the total number of original FPG categories (FPG category ≥3 and FPG category = 2). There was slight or significant heterogeneity among these studies. The results should be interpreted critically.