Table 1

Definition of factory cohorts and summary of work history data

	Census cohort		Entry cohort
Factory	Census date	n*	Year of hire	n†	Type of production‡	Type of diisocyanate	Work history data§	Size of job dictionary¶
*Number of employees in employment on the census date and first employed on an earlier date.
†Number of employees first employed in specified years of hire.
‡B, block plant production; M, moulding.
§J, job titles available; D, department titles available.
¶Number of unique factory/job/department titles.
1	1/1/1977	451	1977–79	134	B+M	TDI+MDI	J+D	727
2	1/1/1975	55	1975–79	67	B	TDI	J+D	59
3	1/1/1964	995	1964–79	2755	B+M	TDI+MDI	J+D	1761
4	1/1/1958	323	1958–79	661	B	TDI	J+D	531
5	1/1/1970	405	1970–79	698	M	TDI	J+D	339
6	1/1/1968	101	1968–79	399	B+M	TDI+MDI	J+D	205
7	1/1/1972	78	1972–79	78	B	TDI+MDI	J+D	47
8	1/1/1976	252	1976–79	142	M	TDI+MDI	J+D	240
9	1/1/1972	138	1972–79	170	B+M	TDI+MDI	J+D	355
10	1/1/1976	46	1976–79	93	B+M	TDI+MDI	J+D	104
11	1/1/1972	86	1972–79	161	B+M	TDI	J+D	284
Total	–	2930	–	5358	–		–	4652