Adolescent use of mobile phones for calling and for sending text messages after lights out: results from a prospective cohort study with a one-year follow-up.

@article{Bulck2007AdolescentUO,
  title={Adolescent use of mobile phones for calling and for sending text messages after lights out: results from a prospective cohort study with a one-year follow-up.},
  author={Jan J M Van den Bulck},
  journal={Sleep},
  year={2007},
  volume={30 9},
  pages={1220-3}
}
OBJECTIVE To assess the prevalence of the use of mobile phones by adolescents after lights out and its relationship to tiredness levels after one year. DESIGN Prospective cohort study with self-reports and follow up questionnaire after one year. SETTING Second- and fifth-year secondary school children in 15 schools in Flanders, Belgium. PARTICIPANTS 1656 school children; 52.1% boys. Average age was 13.7 years (SD: 0.68) in the youngest group and 16.9 years (SD: 0.83) in the oldest group… CONTINUE READING

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