(1·66 to 2·53)2·15 (1·73 to 2·65)4·77 (−1·61 to 12·57)–9·72 (−15·13 to −3·27)*··Other leukaemia0·26 (0·21 to 0·31)0·26 (0·21 to 0·31)–1·61 (−9·46 to 6·91)–15·64 (−21·92 to −9·05)*12·35 (9·66 to 14·91)11·64 (9·27 to 14·19)–5·80 (−13·73 to 2·60)–17·95 (−24·52 to −11·12)*4Occupational exposure to nickel: all causes6·68 (0·95 to 17·47)8·10 (1·24 to 20·81)21·35 (15·63 to 32·69)*–6·73 (−11·14 to 2·03)187·01 (27·49 to 483·87)221·35 (34·93 to 563·34)18·37 (12·66 to 29·20)*–8·40 (−12·92 to 0·27)··Tracheal, bronchus, and lung cancer6·68 (0·95 to 17·47)8·10 (1·24 to 20·81)21·35 (15·63 to 32·69)*–6·73 (−11·14 to 2·03)187·01 (27·49 to 483·87)221·35 (34·93 to 563·34)18·37 (12·66 to 29·20)*–8·40 (−12·92 to 0·27)4Occupational exposure to polycyclic aromatic hydrocarbons: all causes3·41 (2·89 to 3·92)4·53 (3·83 to 5·29)32·92 (26·40 to 39·18)*2·21 (−2·06 to 6·07)97·03 (82·37 to 111·83)125·78 (105·37 to 145·87)29·63 (22·78 to 35·89)*0·51 (−4·05 to 4·55)··Tracheal, bronchus, and lung cancer3·41 (2·89 to 3·92)4·53 (3·83 to 5·29)32·92 (26·40 to 39·18)*2·21 (−2·06 to 6·07)97·03 (82·37 to 111·83)125·78 (105·37 to 145·87)29·63 (22·78 to 35·89)*0·51 (−4·05 to 4·55)4Occupational exposure to silica: all causes50·95 (28·57 to 73·67)58·40 (31·42 to 86·00)14·63 (8·41 to 19·51)*–12·09 (−16·90 to −8·34)*1396·95 (774·36 to 2030·14)1574·57 (860·21 to 2314·76)12·71 (6·89 to 17·49)*–12·64 (−17·10 to −8·94)*··Tracheal, bronchus, and lung cancer40·38 (17·91 to 63·22)48·00 (21·24 to 75·45)18·88 (13·37 to 24·69)*–8·64 (−12·83 to −4·21)*1123·77 (503·32 to
