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Ann Epidemiol. 2016 Dec;26(12):827-832.e2. doi: 10.1016/j.annepidem.2016.09.013. Epub 2016 Oct 8.

Investigation of bias related to differences between case and control interview dates in five INTERPHONE countries.

Author information

1
Barcelona Institute for Global Health (ISGlobal), Barcelona, Spain; Universitat Pompeu Fabra (UPF), Barcelona, Spain; CIBER Epidemiología y Salud Pública (CIBERESP), Madrid, Spain; McLaughlin Centre for Population Health Risk Assessment, University of Ottawa, Ottawa, Canada. Electronic address: michelle.turner@isglobal.org.
2
The Cancer & Radiation Epidemiology Unit, The Gertner Institute, Chaim Sheba Medical Center, Israel; Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel.
3
Barcelona Institute for Global Health (ISGlobal), Barcelona, Spain; Universitat Pompeu Fabra (UPF), Barcelona, Spain; CIBER Epidemiología y Salud Pública (CIBERESP), Madrid, Spain.
4
Sydney School of Public Health, The University of Sydney, Sydney, Australia.
5
The Cancer & Radiation Epidemiology Unit, The Gertner Institute, Chaim Sheba Medical Center, Israel.
6
Cancer Epidemiology Centre, Cancer Council Victoria, Melbourne, Australia.
7
McLaughlin Centre for Population Health Risk Assessment, University of Ottawa, Ottawa, Canada; Department of Epidemiology and Community Medicine, Faculty of Medicine, University of Ottawa, Ottawa, Canada.
8
Unité Mixte de Recherche Epidémiologique Transport Travail Environnement Université Lyon 1/IFSTTAR, Université de Lyon, Lyon, France.
9
Cancer Control Research, British Columbia Cancer Agency, Vancouver, Canada.
10
INRS-Institut Armand-Frappier, Université du Québec, Laval, Canada.
11
University of Montreal Hospital Research Centre, Montreal, Canada.
12
School of Population Health, University of Auckland, Auckland, New Zealand.

Abstract

PURPOSE:

Associations between cellular telephone use and glioma risk have been examined in several epidemiological studies including the 13-country INTERPHONE study. Although results showed no positive association between cellular telephone use and glioma risk overall, no increased risk for long-term users, and no exposure-response relationship, there was an elevated risk for those in the highest decile of cumulative call time. However, results may be biased as data were collected during a period of rapidly increasing cellular telephone use, and as controls were usually interviewed later in time than cases.

METHODS:

Further analyses were conducted in a subset of five INTERPHONE study countries (Australia, Canada, France, Israel, New Zealand) using a post hoc matching strategy to optimize proximity of case-to-control interview dates and age.

RESULTS:

Although results were generally similar to the original INTERPHONE study, there was some attenuation of the reduced odds ratios and stronger positive associations among long-term users and those in the highest categories for cumulative call time and number of calls (eighth-ninth and 10th decile).

CONCLUSIONS:

Proximity and symmetry in timing of case-to-control interviews should be optimized when exposure patterns are changing rapidly with time.

KEYWORDS:

Case-control study; Cellular telephone; Glioma; Matching

PMID:
28340909
DOI:
10.1016/j.annepidem.2016.09.013
[Indexed for MEDLINE]

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