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  Indian J Med Microbiol
 

Figure 4: Subgroup analysis for the association between transportation noise and ischemic heart disease among adult population. CI is confidence interval. The dotted vertical line corresponds to no effect of noise exposure on health outcome. I2 is measure of heterogeneity across the studies

Figure 4: Subgroup analysis for the association between transportation noise and ischemic heart disease among adult population. CI is confidence interval. The dotted vertical line corresponds to no effect of noise exposure on health outcome. <i>I</i><sup>2</sup> is measure of heterogeneity across the studies