Table 1

Study of United Kingdom electricity generation and transmission workers: distribution of deaths and person-years at risk, 1973–97

Brain tumours1-150 All other causes1-151 Person-years at risk
Estimated cumulative exposure to magnetic fields (μT.y):1-152
 0–2.4956055930589
 2.5–4.9181581164656
 5.0–9.9222568220076
 10.0–19.9202243174386
 ⩾20.0870273404
Estimated cumulative exposure to magnetic fields received in the preceding 5 years (μT.y):1-152 1-153
 Zero867503837344
 0.01–0.49171159184546
 0.5–1.913668138453
 2.0–4.96374102799
 ⩾5.0218752472
Attained age:
 15–1902215176
 20–2402854700
 25–2924298219
 30–34479140873
 35–398147167227
 40–4411226177060
 45–498455182771
 50–5420849186126
 55–59301519181532
 60–64382343156070
 65–69192904112349
 70–7419249562212
 75–794148523429
 80–8405555367
Sex:
 Male157124911363200
 Female6658199911
Calendar period:
 1973–9231249277664
 1980–4312214375844
 1985–9313126366254
 1990–7786560543349
Year of starting employment:
 <1946474231667
 1946–64746372458199
 1965–72444110486891
 ⩾1973411925586354
Period from first employment (y):
 0–910748351041
 10–19602938568945
 20–29454384398686
 ⩾30485079244439
Employment:1-154
 Still employed402155674132
 Left employment12310994888979
Negotiating body (pay and conditions):
 NJM512910960
 NJB401801354839
 NJC131205252053
 NJIC1059784929972
 NJ(B + C)E021313725
 Not known0171562
Total163131491563111

  • ↵1-150 Any part of death certificate coded to ICD-9 191,192, 225, 237.5 or 237.6.

  • ↵1-151 No part of death certificate coded to ICD-9 191,192, 225, 237.5 or 237.6.

  • ↵1-152 1 year refers to a working year, about 250 8 hour shifts.

  • ↵1-153 Follow up to 31 March 1994.

  • ↵1-154 Subjects enter person-years at risk for left employment category 3 months after date of leaving.