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I am concerned that the follow up data on the developmental scores was very weak. There was a major drop off in the number of infants followed over time (with about 20% getting long term follow-up)**. Also, it appears they did not publish enough data on the the actual scores, just means of infants in radiation groups of "low, medium, high" (no standard deviation). FURTHER, they seemed to have aggregated all infant scores at all follow-up times into the means scores, rather than showing data at each age of development. Since neurodevelopment is, by definition, a longitudinal (time-sensitive) variable, they need to show the score at each age of development,. not aggregate them. This is especially critical given the vast numbers of babies lost to followup.

They only published numbers in each group considered "normal, monitor and refer", but not the scores in those groups (at each stage of follow-up age).

In addition, the researchers acknowledge that they did not measure parental interaction. Perhaps in homes with strong wifi, the parents are so distracted using the wifi that they are neglecting their children (a significant confounding variable).

I agree this is an important issue, but this study has major flaws.

David McKalip, M.D.

Neurological Surgeon.

(**"The observations for ASQ were as follows: 2 months - 96; 4 months - 54; 6 months - 38; 8 months - 25; 9 months - 16; 10 months - 15; and 12 months - 17.)

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