Fig. 2From: Occupational exposure to silica dust and risk of lung cancer: an updated meta-analysis of epidemiological studiesForest plot showing pooled standardized mortality ratio (SMR) of lung cancer due to silica dust. SMR, Standardized mortality ratio; RE, Random effect; I2, Variability due to heterogeneity; Q, Chi-square test for heterogeneity; K, Number of studiesBack to article page