Table 1

Two hypothetical workers in a cohort study with follow-up through 1985. One worker retired in 1982, the other in 1975. Discrete time hazard data structures

(a) Structure including records for person-periods through last observation
ID	Year	Age	Follow-up, u	Covariate, w	Annual exposure	Cumulative exposure	Y
1	1970	31	0	1	0.00	0.00	0
1	1971	32	1	1	0.00	0.00	0
1	1972	33	2	1	0.00	0.00	0
1	1973	34	3	1	0.00	0.00	0
1	1974	35	4	1	0.00	0.00	0
1	1975	36	5	1	0.00	0.00	0
1	1976	37	6	1	0.00	0.00	0
1	1977	38	7	1	1.62	1.62	0
1	1978	39	8	1	1.30	2.92	0
1	1979	40	9	1	1.90	4.82	0
1	1980	41	10	1	1.30	6.12	0
1	1981	42	11	1	1.10	7.22	0
1	1982	43	12	1	0.76	7.98	0
1	1983	44	13	1	0.00	7.98	0
1	1984	45	14	1	0.00	7.98	0
1	1985	46	15	1	0.00	7.98	0
2	1967	37	0	1	3.26	3.26	0
2	1968	38	1	1	3.71	6.97	0
2	1969	39	2	1	1.78	8.75	0
2	1970	40	3	1	4.09	12.84	0
2	1971	41	4	1	2.21	15.05	0
2	1972	42	5	1	1.90	16.95	0
2	1973	43	6	1	0.24	17.19	0
2	1974	44	7	1	0.10	17.29	0
2	1975	45	8	1	0.00	17.29	0
2	1976	46	9	1	0.00	17.29	0
2	1977	47	10	1	0.00	17.29	0
2	1978	48	11	1	0.00	17.29	0
2	1979	49	12	1	0.00	17.29	0
2	1980	50	13	1	0.00	17.29	1

(b) Structure extended to span period through administrative end of follow-up for all cohort members
ID	Year	Age	Follow-up	Baseline covariate	Ann exposure	Cumulative exposure	Y	C	F	H(U)
1	1970	31	0	1	0.00	0.00	0	1	1	0.001859682
1	1971	32	1	1	0.00	0.00	0	1	1	0.001997535
1	1972	33	2	1	0.00	0.00	0	1	1	0.002145584
1	1973	34	3	1	0.00	0.00	0	1	1	0.002304581
1	1974	35	4	1	0.00	0.00	0	1	1	0.002475332
1	1975	36	5	1	0.00	0.00	0	1	1	0.002658700
1	1976	37	6	1	0.00	0.00	0	1	1	0.002855612
1	1977	38	7	1	1.62	1.62	0	1	0	0.003067064
1	1978	39	8	1	1.30	2.92	0	1	0	0.003294121
1	1979	40	9	1	1.90	4.82	0	1	0	0.003537928
1	1980	41	10	1	1.30	6.12	0	1	0	0.003799711
1	1981	42	11	1	1.10	7.22	0	1	0	0.004080785
1	1982	43	12	1	0.76	7.98	0	1	0	0.004382559
1	1983	44	13	1	0.00	7.98	0	1	0	0.004706544
1	1984	45	14	1	0.00	7.98	0	1	0	0.005054358
1	1985	46	15	1	0.00	7.98	0	1	0	0.005427736
2	1967	37	0	1	3.26	3.26	0	1	0	0.000000263
2	1968	38	1	1	3.71	6.97	0	1	0	0.000000282
2	1969	39	2	1	1.78	8.75	0	1	0	0.000000303
2	1970	40	3	1	4.09	12.84	0	1	0	0.000000326
2	1971	41	4	1	2.21	15.05	0	1	0	0.000000350
2	1972	42	5	1	1.90	16.95	0	1	0	0.000000376
2	1973	43	6	1	0.24	17.19	0	1	0	0.000000404
2	1974	44	7	1	0.10	17.29	0	1	0	0.000000434
2	1975	45	8	1	0.00	17.29	0	1	0	0.000000466
2	1976	46	9	1	0.00	17.29	0	1	0	0.000000501
2	1977	47	10	1	0.00	17.29	0	1	0	0.000000538
2	1978	48	11	1	0.00	17.29	0	1	0	0.000000578
2	1979	49	12	1	0.00	17.29	0	1	0	0.000000621
2	1980	50	13	1	0.00	17.29	1	1	0	0.000000667
2	1981	51	14	1	–	–	–	0	0	0.000000717
2	1982	52	15	1	–	–	–	0	0	0.000000770
2	1983	53	16	1	–	–	–	0	0	0.000000827
2	1984	54	17	1	–	–	–	0	0	0.000000888
2	1985	55	18	1	–	–	–	0	0	0.000000954