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Cell phone use and behavioural problems: indications of unobserved heterogeneity in Divan et al's study
  1. Jarle Aarstad
  1. Faculty of Engineering, Bergen University College, Bergen, Norway
  1. Correspondence to Dr Jarle Aarstad, Faculty of Engineering, Bergen University College, PO Box 7030, Nygardsgaten 112, NO-5020 Bergen, Norway; jarle.aarstad{at}

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Divan et al1 find that prenatal and postnatal exposure to cell phone use is associated with behavioural problems at age 7 years. The study controls for relevant confounders, but the results nevertheless indicate that unobserved heterogeneity is present, I argue. What particularly draws my attention is the declining effect of prenatal and postnatal cell phone use on behavioural problems for the birth years between 1998 and 2000 (see tables 1 and 2 in Divan …

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    Hozefa A Divan Leeka Kheifets Carsten Obel Jørn Olsen