Adult nationwide phone dating

There was no indication of dose-response relation either by years since first subscription for a mobile phone or by anatomical location of the tumour—that is, in regions of the brain closest to where the handset is usually held to the head.

In addition, we were able to obtain information on socioeconomic status on an individual level, allowing adjustment for education and income when estimating risks related to mobile phone use.Information on cancer diagnosis was available from the Danish Cancer Register, which provides accurate and virtually complete nationwide ascertainment of cancers since 1943, including benign tumours of the central nervous system.13 Cancers were classified according to a modified Danish version of ICD-10 (the international classification of diseases, 10th revision).14 Topography and morphology were categorised according to the first revision (ICD-O1) (until 2003) and third revision (ICD-O3) (2004-2007) of the international classification of diseases for oncology.15 Date of birth, sex, date of emigration, or date of death were available for each cohort member from the Danish central population register.For the present analysis, follow-up for the occurrence of cancer started at age 30 or 1 January 1990, whichever occurred later, and ended on the date of first diagnosis of cancer (except for non-melanoma skin cancer), date of death, date of emigration, or 31 December 2007, whichever came first.Results for long term mobile phone users (≥10 years) remain scarce, and all epidemiological studies are based on few cases.4 In addition, most studies have been retrospective case-control studies with self reported data on mobile phone use, which are prone to bias, particularly random reporting bias and differential recall bias for cases and controls, which hampers the risk estimation and precludes firm conclusions.5 6The only cohort study investigating mobile phone use and cancer to date is a Danish nationwide study comparing cancer risk of all 420 095 people who had signed a mobile phone contract with a phone company (subscribers) from 1982 (the year such phones were introduced in Denmark) until 1995, with the corresponding risk in the rest of the adult population with follow-up to 19967 and then 2002.8 The study found no evidence of any increased risk of brain or nervous system tumours or any cancer among mobile phone subscribers.There was, however, a decreased risk (standardised incidence ratio 0.66, 0.44 to 0.95) of developing a tumour of the brain or nervous system in people who had had a subscription for more than 10 years, but this result was based on only 28 cases.8 In addition, it was observed that male mobile phone subscribers were at a lower risk (standardised incidence ratio 0.88, 0.86 to 0.91) of developing tobacco related cancers.

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