Table 4

Relative risks of mortality from lung cancer and all other causes by type of work and daily consumption of cigarettes, 1972–97

Variables	n	Separate analysis^4-151 RR (95% CI)	Simultaneous analysis^4-152 RR (95% CI)
Lung cancer:
Type of worker:
Comparison workers	51	1.0	1.0
Chrome platers	65	1.44 (1.00 to 2.08)	1.39 (0.96 to 2.00)
Cigarette smoking: daily habit (g/day)^{^4-153:}
Lifelong non-smoker	6	1.0	1.0
1–4	4	5.73^4-160 (1.62 to 20.32)	5.50^4-160 (1.55 to 19.57)
5–14	21	3.15^4-150 (1.27 to 7.82)	3.09^4-150 (1.24 to 7.66)
15–24	46	5.58^4-165 (2.38 to 13.11)	5.50^4-165 (2.34 to 12.92)
⩾25	19	6.01^4-165 (2.39 to 15.10)	5.97^4-165 (2.37 to 15.02)
Ex-smoker	4	0.84 (0.24 to 2.97)	0.84 (0.24 to 2.98)
Smoking status unknown	16	3.40^4-150 (1.33 to 8.70)	3.32^4-150 (1.28 to 8.60)
Employment^4-154:
Employed	33	1.0	1.0
Left employment	83	0.99 (0.66 to 1.48)	0.98 (0.65 to 1.49)
All causes excluding lung cancer:
Type of worker:
Referents	354	1.0	1.0
Chrome platers	346	1.10 (0.95 to 1.28)	1.10 (0.95 to 1.28)
Cigarette smoking: daily habit (g/day)^4-153:
Lifelong non-smoker	112	1.0	1.0
1–4	16	1.21 (0.72 to 2.04)	1.20 (0.71 to 2.04)
5–14	149	1.26 (0.99 to 1.62)	1.26 (0.98 to 1.61)
15–24	181	1.31^4-150 (1.03 to 1.66)	1.31^4-150 (1.03 to 1.66)
⩾25	84	1.64^4-165 (1.23 to 2.18)	1.64^4-165 (1.23 to 2.19)
Ex-smoker	80	0.97 (0.73 to 1.30)	0.98 (0.73 to 1.30)
Smoking status unknown	78	0.94 (0.71 to 1.26)	0.94 (0.70 to 1.27)
Employment^4-154:
Employed	197	1.0	1.0
Left employment	503	0.95 (0.80 to 1.12)	0.99 (0.83 to 1.17)

↵4-150 p<0.05;
↵4-160 p<0.01;
↵4-165 p<0.001.
↵4-151 Separate analysis of the three variables (type of worker, cigarette smoking, employment), each set of relative risks adjusted for sex and age (15–39, 40–44, 45–49, 50–54, 55–59, 60–64, 65–69, 70–74, 75–79, 80–84).
↵4-152 Simultaneous analysis of the three variables, adjusted for sex and age.
↵4-153 g/day. Combined use of hand rolled and manufactured cigarettes, manufactured cigarettes were considered to contain 1g of tobacco.
↵4-154 See footnote^4-150, table 1.