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

		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

^a) Obs.: observed deaths; * P < 0.05