From: Mortality among workers exposed to asbestos at the shipyard of Genoa, Italy: a 55 years follow-up
 |  | All Causes | All Cancers | Larynx Cancer | Lung Cancer | Pleural Cancer | Respiratory Diseases | ||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Covariates | PY | Obs.a | SMR | Obs. | SMR | Obs. | SMR | Obs. | SMR | Obs. | SMR | Obs. | SMR |
Time since first hire (years) | |||||||||||||
 0–19 | 31,802 | 321 | 119* | 126 | 136* | 5 | 143 | 46 | 152* | 11 | 651* | 26 | 175* |
 20–29 | 24,591 | 492 | 93 | 198 | 122* | 7 | 141 | 69 | 141* | 11 | 328* | 46 | 112 |
 30–39 | 19,222 | 710 | 102 | 270 | 132* | 11 | 204* | 103 | 176* | 21 | 518* | 76 | 134* |
 > =40 | 23,554 | 1808 | 97 | 590 | 125* | 23 | 205* | 181 | 149* | 60 | 681* | 211 | 124* |
P value t trend | Â | Â | 0.051 | Â | 0.521 | Â | 0.324 | Â | 0.941 | Â | 0.274 | Â | 0.319 |
Age at hire (years) | |||||||||||||
 0–24 | 36,495 | 1143 | 97 | 428 | 130* | 21 | 242* | 148 | 162* | 43 | 683* | 124 | 124* |
 25–34 | 28,273 | 861 | 109* | 310 | 147* | 13 | 224* | 97 | 172* | 31 | 788* | 80 | 122 |
 > =35 | 34,401 | 1327 | 96 | 446 | 113* | 12 | 113 | 154 | 138* | 29 | 378* | 155 | 132* |
P value t trend | Â | Â | 0.886 | Â | 0.251 | Â | 0.037 | Â | 0.154 | Â | 0.023 | Â | 0.599 |
Period of hire | |||||||||||||
 < =1940 | 23,838 | 1529 | 119* | 444 | 150* | 22 | 245* | 156 | 215* | 37 | 760* | 186 | 158* |
 1941–1960 | 32,009 | 922 | 89* | 379 | 124* | 9 | 113 | 126 | 143* | 39 | 641* | 91 | 106 |
 1961–1970 | 11,959 | 243 | 73* | 110 | 105 | 4 | 159 | 36 | 117 | 8 | 378* | 22 | 84 |
 > =1971 | 31,363 | 637 | 91* | 251 | 110 | 11 | 196 | 81 | 119 | 19 | 393* | 60 | 115 |
P value t trend |  |  | 0.074 |  | < 0.001 |  | 0.601 |  | < 0.001 |  | 0.009 |  | 0.071 |
Length of employment (years) | |||||||||||||
 0–9 | 19,902 | 416 | 98 | 129 | 104 | 5 | 152 | 46 | 129 | 6 | 234 | 44 | 131 |
 10–19 | 31,572 | 946 | 97 | 348 | 123* | 10 | 132 | 108 | 133* | 27 | 494* | 113 | 141* |
 20–29 | 22,921 | 720 | 108* | 263 | 145* | 10 | 196 | 90 | 180* | 29 | 843* | 63 | 114 |
 > =30 | 24,774 | 1249 | 96 | 444 | 129* | 21 | 230* | 155 | 167* | 41 | 638* | 139 | 123* |
P value t trend | Â | Â | 0.965 | Â | 0.078 | Â | 0.163 | Â | 0.031 | Â | 0.063 | Â | 0.356 |