Table 9

Relative risks of mortality from acute myeloid leukaemia and chronic myeloid leukaemia by levels of estimated magnetic field exposure received in preceding 5 years in subcohort with work histories (n = 79 972) (four separate analyses): study of United Kingdom electricity generation and transmission workers, 1973–94

Magnetic field exposure received in preceding 5 years (μT.y)9-150 n RR9-151 (95% CI) RR9-152 (95% CI)
Acute myeloid leukaemia9-153:
 Zero281.01.0
 0.01–0.4951.14(0.47 to 2.74)1.14(0.47 to 2.78)
 0.5–1.9930.90(0.27 to 3.02)0.98(0.29 to 3.34)
 2.0–4.9920.86(0.20 to 3.69)0.96(0.22 to 4.18)
 ⩾5.010.83(0.11 to 6.20)0.93(0.12 to 7.05)
 p Value for trend9-154 p>0.50 and >0.50p>0.50 and >0.50
Chronic myeloid leukaemia9-160:
 Zero111.01.0
 0.01–0.4920.92(0.21 to 4.10)0.73(0.16 to 3.31)
 0.5–1.9910.75(0.09 to 5.89)0.56(0.07 to 4.52)
 2.0–4.9911.13(0.14 to 8.990.84(0.10 to 6.74)
 ⩾5.012.29(0.28 to 18.46)1.40(0.17 to 11.49)
 p Value for trend9-154 p>0.50 and =0.44p>0.50 and >0.50

  • ↵9-150 See footnote 9-151table 6.

  • ↵9-151 Analysed simultaneously with sex and attained age.

  • ↵9-152 Analysed simultaneously with sex, attained age, calendar period, year of starting employment, and negotiating body. For levels, see table 4.

  • ↵9-153 See footnote 9-153table 7.

  • ↵9-154 See footnote 9-160table 8.

  • ↵9-160 See footnote 9-160table 7.