Figure 3

Forest plots. a: Forest plots for cohort studies comparing risk of cancer by serum glucose levels with serum glucose < 6.11 mmol/L as the reference category. b: Forest plots for nested case–control and case-cohort studies comparing risk of cancer by serum glucose levels with serum glucose < 6.11 mmol/L as the reference category. c: Forest plots for hospital-based case–control studies comparing risk of cancer by serum glucose levels with serum glucose < 6.11 mmol/L as the reference category.