Hardell L, Carlberg M, Mild KH (2006b)

The authors report on a case-control study that examined the risk of various types of cell and cordless phones on the development of malignant brain tumours. The study was done on patients aged 20-80 years diagnosed with brain tumours in two regions of Sweden in the years 2000-2003. The methodology was the same as a study done by the same authors in 1997-2000.

A total of 1168 cases were reported, and 820 cases were able to be studied, of which 359 had malignant tumours. The controls were from the same region and were matched on age and randomly selected according to the different number of cases in 5-year age groupings. The cases and controls answered a questionnaire, supplemented if necessary with a phone interview.

Of the 359 cases, 317 participated. Of the 820 controls, 692 participated. The ORs for analogue phones were 2.6 for overall use and 3.5 for > 10 years' use. The corresponding results for digital phones were 1.9 and 3.6, and for cordless phones 2.1 and 2.9. In multivariate analysis, the ORs were lower but remained statistically significant only for analogue phones and for the overall use of cordless phones. The results are similar to those seen in their previous study.

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