Forest plot of mentholated vs. non-mentholated cigarette smoking of any product and all lung cancer. Table 14 presents the results of a meta-analysis for all lung cancer based on six relative risk (RR) and 95% confidence interval (CI) estimates for mentholated vs. non-mentholated cigarette smoking. The individual study estimates are shown numerically and graphically on a logarithmic scale sorted on sex within study reference (REF) within start year of study (START) within continent (CONT). The studies are sorted in order of sex within study reference (REF). In the graphical representation individual RRs are indicated by a solid square, with the area of the square proportional to the weight (inverse-variance of log RR). Arrows indicate where the CI extends outside the range allocated. Also shown are the combined random-effects estimates. These are represented by a diamond of standard height, with the width indicating the 95% CI.