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Table 3 Standardized Mortality Ratio (SMR) for all causes and site specific causes of death computed in shipyard workers by time since first hire, age at hire, calendar period of hire, and length of employment at the Genoa shipyard

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    0.051   0.521   0.324   0.941   0.274   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    0.886   0.251   0.037   0.154   0.023   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    0.965   0.078   0.163   0.031   0.063   0.356
  1. a) Obs.: observed deaths; * P < 0.05