Table 2.

Relative risks (HRs) for lung cancer in relation to duration of employment in jobs grouped by similar processes

Process grouping/ years worked	Cases	Non-cases	HR*	(95% CI)
Warehouse, packing, quality control
0	530	2665	1.0
1–9	36	182	1.1	(0.8 to 1.7)
10–19	32	148	1.2	(0.8 to 1.9)
≥20	30	190	0.8	(0.5 to 1.2)
Cotton handling, processing, spinning
0	509	2558	1.0
1–9	35	123	1.2	(0.8 to 1.7)
10–19	30	153	1.0	(0.6 to 1.4)
≥20	54	321	0.7	(0.5 to 1.0)
Wool handling, processing, spinning
0	608	3084	1.0
1–9	5	20	1.1	(0.4 to 3.0)
10–19	5	28	0.8	(0.3 to 2.2)
≥20	10	53	0.7	(0.4 to 1.4)
Silk handling, processing, spinning
0	622	3153	1.0
>0	6	32	1.0	(0.4 to 2.3)
Synthetic fibre handling, processing, spinning
0	612	3097	1.0
1–9	2	31	0.2	(0.1 to 1.0)
10–19	8	25	1.5	(0.7 to 3.5)
≥20	6	32	0.7	(0.3 to 1.8)
Mixed fibre handling, processing, spinning
0	525	2743	1.0
1–9	20	126	0.7	(0.4 to 1.2)
10–19	31	114	1.5	(0.9 to 1.7)
≥20	52	202	1.2	(0.9 to 1.7)
Scouring, bleaching
0	624	3158	1.0
>0	4	27	0.8	(0.3 to 2.8)
Dyeing
0	613	3129	1.0
1–9	5	19	1.5	(0.5 to 4.4)
10–19	4	19	1.0	(0.3 to 2.8)
≥20	6	18	2.3	(0.9 to 6.1)
Finishing
0	622	3145	1.0
>0	6	40	0.7	(0.3 to 1.7)
Weaving
0	384	2065	1.0
1–9	61	231	1.4	(1.0 to 1.9)
10–19	67	295	1.2	(0.9 to 1.7)
≥20	116	594	0.9	(0.8 to 1.2)
Sewing, cutting
0	575	2890	1.0
1–9	17	87	1.2	(0.7 to 2.0)
10–19	19	96	1.1	(0.7 to 1.9)
≥20	17	112	0.9	(0.5 to 1.6)
Maintenance
0	610	3079	1.0
1–9	7	48	1.0	(0.4 to 2.1)
10–19	6	27	1.2	(0.4 to 2.6)
≥20	5	31	1.0	(0.4 to 2.6)
Administration, other non-production
0	451	2277	1.0
1–9	74	338	1.8	(1.0 to 1.8)
10–19	55	268	1.3	(1.0 to 1.9)
≥20	48	302	0.9	(0.7 to 1.3)

^*HR adjusted for age and smoking.