students with known cognitive disorder and those receiving medication known to impair or alter cognitive function
Statistical analysis method:
multiple linear regression analysis
ethnicity (languages other than English spoken at home), growth (difference in height between 1st and 2nd examination) D: Herkunft (andere Sprachen als Englisch zu Hause gesprochen), Wachstum (Unterschied in Körpergröß
Conclusion (acc. to author)
The proportion of mobile phone owners, the total number of voice calls and SMS per week increased from baseline to follow-up. 75% of the adolescents owned a mobile phone at the baseline and 86 % at follow-up. At baseline, students reported a median of 8 voice calls and 8 SMS per week, at follow-up a median of 10 voice calls and 10 SMS per week. The increase in exposure over the study period was mainly observed among those with lower numbers of calls at baseline. Associations between the use of mobile phones and changes in some of the cognitive outcomes were observed, especially changes in response times rather than changes in accuracy. Participants with more voice calls and SMS at baseline, but no increase in exposure at follow-up, showed lesser reductions in response times over the 1-year period in some of the CogHealth tasks. No associations were seen between mobile phone use and the Stroop Color-Word test. Furthermore, differences in the number of text messages were not related to changes in any of the CogHealth or Stroop tasks. The authors concluded that the observed changes in cognitive function over time may relate to statisticalregression toward the mean, and not be the effect of mobile phoneexposure.
Study funded by
National Health and Medical Research Council (NHMRC), Australia
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