ID Number		1837
Study Type		Epidemiology
Model		Mobile phone exposure assessment using network operator records
Details		Human volunteers (n = 84) were followed for mobile phone use to compare recall (over a 3 month period) vs. network operator records. The authors reported an group average over-estimation of total minutes (1.46, 95% CI 1.32-1.62; or an over-estimation of 46% (although ~20% of individuals actually under-estimated their individual total minutes). They also reported lighter users tend to under-estimate exposure (corroborating the results of Vrijheid 2008). The authors developed an algorithm (univariate regression) to adjust for self-reported monthly minutes in future studies.
Findings		Not Applicable to Bioeffects
Status		Completed With Publication
Principal Investigator		STUK: Radiation Nuclear Safety Authority, Finland - Anssi.Auvinen@uta.fi
Funding Agency		EU, Nat'l Res Prog, Finland, TEKES
Country		FINLAND
References		Tokola, K et al. Bioelectromagnetics, (2008) 29:559-563
Comments		The volunteers did not have a brain tumor (which may be a large factor in the over-estimation bias. Further, the study was performed 6 months after a 3 month use period, not over 10+ years. Finally, the act of recruitment may have selected for more active phone users (from Vrijheid et al 2008, most subjects under-estimated number of calls per month, over-estimated call duration, and the over-estimation increased in heavy users)