“…The studies originated from Belgium,55 Canada,42 69 99 109 Chile,59 China,48 67 79 106 111 113 114 England,84 Finland,30 74 Holland,76 India,63 Iran,68 Norway,75 Pakistan,81 Poland,105 Russia,34 Sweden,72 86 Uruguay52 and the USA 35 36 38–40 73 78 88 102 110. Overall, a significantly increased risk for developing lung cancer following wood dust exposure was observed (RR 1.25, 95% CI 1.11 to 1.41, n=38), with ‘considerable’ heterogeneity between studies (I 2 =82.1%, p<0.01; figure 2).…”