title: [A literature analysis of power frequency electric field testing data].
abstract: OBJECTIVE
  To analyze the literature on power frequency electric field testing data and to propose views and suggestions for current testing.
  
  
  METHODS
  The literature on power frequency electric field testing data published in the previous years was searched to identify 306 articles involving 193 valid testing data. Mann-Whitney test and Wilcoxon W test were used for analyzing the testing data.
  
  
  RESULTS
  The classification of data was carried out according to one quarter of occupational exposure limit (1.25 kV/m), one half of the exposure limit (2.5 kV/m), and the exposure limit (5 kV/m). The structure of testing data showed a significant difference between the non-power facility group and the power facility group (P<0.05).
  
  
  CONCLUSIONS
  As occupational hazard factors, the radiation exposure from power frequency electric field is extensive. However, the power frequency electric field testing data in actual workplaces except high-voltage power facilities are far less than the occupational exposure limit with little harmfulness. There is a phenomenon of excessive testing at present.
authors.forename: Suli
authors.initials: S
authors.lastname: Zhang
authors.forename: Zehua
authors.initials: Z
authors.lastname: Guo
authors.forename: Xintian
authors.initials: X
authors.lastname: Yu
authors.forename: Yan
authors.initials: Y
authors.lastname: Ding
authors.forename: Zhiliang
authors.initials: Z
authors.lastname: Zhu
mesh_terms: D004560:Electricity; D004574:Electromagnetic Fields; D006801:Humans; D016273:Occupational Exposure / Q000592:standards*; D017132:Workplace