title: Risk of cancer in Finnish children living close to power lines.
abstract: OBJECTIVE
  To investigate the risk of cancer in children living close to overhead power lines with magnetic fields of > or = 0.01 microteslas (microT).
  
  
  METHODS
  Cohort study.
  
  
  METHODS
  The whole of Finland.
  
  
  METHODS
  68,300 boys and 66,500 girls aged 0-19 years living during 1970-89 within 500 m of overhead power lines of 110-400 kV in magnetic fields calculated to be > or = 0.01 microT. Subjects were identified by record linkages of nationwide registers.
  
  
  METHODS
  Numbers of observed cases in follow up for cancer and standardised incidence ratios for all cancers and particularly for nervous system tumours, leukaemia, and lymphoma.
  
  
  RESULTS
  In the whole cohort 140 cases of cancer were observed (145 expected; standardised incidence ratio 0.97, 95% confidence interval 0.81 to 1.1). No statistically significant increases in all cancers and in leukaemia and lymphoma were found in children at any exposure level. A statistically significant excess of nervous system tumours was found in boys (but not in girls) who were exposed to magnetic fields of > or = 0.20 microT or cumulative exposure of > or = 0.40 microT years.
  
  
  CONCLUSIONS
  Residentia magnetic fields of transmission power lines do not constitute a major public health problem regarding childhood cancer. The small numbers do not allow further conclusions about the risk of cancer in stronger magnetic fields.
authors.affiliation: Department of Public Health, University of Helsinki, Finland.
authors.forename: P K
authors.initials: PK
authors.lastname: Verkasalo
authors.forename: E
authors.initials: E
authors.lastname: Pukkala
authors.forename: M Y
authors.initials: MY
authors.lastname: Hongisto
authors.forename: J E
authors.initials: JE
authors.lastname: Valjus
authors.forename: P J
authors.initials: PJ
authors.lastname: Järvinen
authors.forename: K V
authors.initials: KV
authors.lastname: Heikkilä
authors.forename: M
authors.initials: M
authors.lastname: Koskenvuo
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D015331:Cohort Studies; D004574:Electromagnetic Fields / Q000009:adverse effects*; D004781:Environmental Exposure; D005260:Female; D005387:Finland / Q000453:epidemiology; D006798:Housing; D006801:Humans; D015994:Incidence; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D009369:Neoplasms / Q000453:epidemiology / Q000209:etiology*; D012111:Residence Characteristics; D012307:Risk Factors