Hardell L, Hallquist A, Mild KH, Carlberg M, et al. (2004)

This group of authors has previously produced a series of papers describing case-control studies investigating the association of cell phones and brain tumours. In this paper similar techniques are used to explore the relationship between cell and cordless phones and tumours of the salivary glands.

Cases of salivary glands were determined from reports to the cancer registries of Sweden during the period 1994 to 2000. Only living cases were investigated. The initial total reported were 415 cases, and after excluding 96 who had died and 26 for other reasons, 293 cases were left. A questionnaire was sent to these individuals and 267 (91%) responded. Four controls were matched to each case by age (within 5 years) and sex. Of the controls, 1053 (90%) answered the questionnaire. A trained nurse also interviewed all subjects over the telephone, to check and supplement the answers. The investigators were blinded to the case or control status of the subject.

The results showed no association between the use of cellular or cordless phones and salivary gland tumours. Odds ratios were 0.92 (95% CI 0.58 - 1.44) for use of analogue phones, 1.01 (0.68 - 1.50) for digital phones, and 0.99 (0.68 - 1.43) for cordless phones. There was no effect of tumour induction period, latency, or tumour localization.

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