Fig. 4From: Association between diabetes mellitus and multi-drug-resistant tuberculosis: evidence from a systematic review and meta-analysisFunnel plot a and contour-enhanced funnel plot b of the included observational studies. In the contour-enhanced plot, the shaded region indicates areas of statistical significance, and non-statistical significance is represented in white. The vertical line corresponds to the summary log (OR) as estimated from the random-effect model (OR, odds ratio)Back to article page