Letters

Health hazards of mobile phones

BMJ 2000; 321 doi: https://doi.org/10.1136/bmj.321.7269.1155/a (Published 04 November 2000) Cite this as: BMJ 2000;321:1155

Prevalence of headache is increased among users in Singapore

  1. Sin-Eng Chia, associate professor,
  2. Hwee-Pin Chia, assistant professor,
  3. Jit-Seng Tan, medical student (cofcse@nus.edu.sg)
  1. Department of Community, Occupational and Family Medicine, Faculty of Medicine, National University of Singapore, Singapore 117597
  2. Saratov State Medical University, PO Box 1528, Saratov, 410601 Russia

    EDITOR—Hand held cellular telephones, using pulse modulated signals of frequency 870-995 MHz, are being used increasingly. Most reports of health symptoms related to use of these phones are anecdotal. We undertook a cross sectional study of a community in Singapore to study the prevalence of specific central nervous system symptoms among users of hand held cellular phones compared with non-users and to determine any association of risk factors and central nervous system symptoms among users of the phones.1

    From a sampling frame of all flats in a large town we conducted a one stage random cluster sampling of 808 individuals, who were interviewed by trained medical students …

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