A letter was written in response to a paper previously published in Cancer Causes and Control. The first author felt that the use of a particular instrument to measure personal exposure of Swedish railway workers to magnetic fields was not appropriate. The instrument used may have presented inaccurate exposure estimates since the frequency response decreased below 30 Hertz and the frequency of the electric current used was 16.66 Hertz. The first author did not feel that this problem was critical to the conclusions of the original paper. However, it was stated that if increased risk due to increased exposure intensity was studied, the inaccuracy of the instrument would probably prove to be a problem. The importance of matching the instrument to the characteristics of the agent being measured was stressed. The author of the original paper was allowed to reply and reiterated that estimates of exposure to magnetic fields was highly dependent on the choice of the instrument and how the measurement was carried out. The original author emphasized that the magnetic field densities were provided in the paper to show that some of the study groups had a high magnetic field exposure during work.
We take your privacy seriously. You can review and change the way we collect information below.
These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. They help us to know which pages are the most and least popular and see how visitors move around the site. All information these cookies collect is aggregated and therefore anonymous. If you do not allow these cookies we will not know when you have visited our site, and will not be able to monitor its performance.
Cookies used to make website functionality more relevant to you. These cookies perform functions like remembering presentation options or choices and, in some cases, delivery of web content that based on self-identified area of interests.
Cookies used to track the effectiveness of CDC public health campaigns through clickthrough data.
Cookies used to enable you to share pages and content that you find interesting on CDC.gov through third party social networking and other websites. These cookies may also be used for advertising purposes by these third parties.