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We were pleased to read the paper by Guxens et al,1 which examined the association of prenatal cell phone and cordless phone use with behavioural problems in children. We are encouraged to see new research on this topic, but would like to point out several limitations in that study.
The authors concluded that they did not find an association between prenatal cell phone use and behavioural problems in children, and that their findings differed from associations in the Danish National Birth Cohort (DNBC) as reported by Divan et al.2 ,3 These conclusions overlook Guxens et al's small sample size of 2529 and much smaller number of exposed cases. The …
Contributors LK, OAA and MS were responsible for conceiving the content of this article. MS wrote the first draft and conducted the data analysis. MS, LK, OAA and JO contributed to writing and editing the manuscript. JO provided access to the Danish National Birth Cohort data.
Funding This work was supported by Lundbeck Foundation [grant number 195/04]; the Danish Medical Research Council [grant number SSVF 0646]; the National Institutes of Health/National Institute of Environmental Health Sciences [grant number R21ES016831]; and a Veni career grant from the Netherlands Organization for Scientific Research (NWO) to OAA [grant number 916.96.059].
Competing interests None.
Ethics approval Danish Data Protection Agency; Regional Scientific Ethics Committees in Denmark; Office for the Protection of Research Subjects at the University of California, Los Angeles.
Provenance and peer review Not commissioned; internally peer reviewed.