Forest plot of handrolled vs. manufactured cigarette smoking and all lung cancer. Table 14 presents the results of a meta-analysis for all lung cancer based on 20 relative risk (RR) and 95% confidence interval (CI) estimates for handrolled vs. manufactured cigarette smoking. The individual study estimates are shown numerically and graphically on a logarithmic scale. The studies are sorted on sex within study reference (REF) within start year of study (START) within continent (CONT). 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.