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Transcranial Direct Current Stimulation for Online Gamers
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Internet addiction in Hong Kong adolescents: a three-year longitudinal study

Lu Yu1, Daniel Tan Lei Shek

  • 1Department of Applied Social Sciences, The Hong Kong Polytechnic University, Hong Kong, PR China. lu.yu@inet.polyu.edu.hk

Journal of Pediatric and Adolescent Gynecology
|May 21, 2013
PubMed
Abstract

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Sometimes we want to see how people change over time, as in studies of human development and lifespan. When we test the same group of individuals repeatedly over an extended period of time, we are conducting longitudinal research. Longitudinal research is a research design in which data-gathering is administered repeatedly over an extended period of time. For example, we may survey a group of individuals about their dietary habits at age 20, retest them a decade later at age 30, and then again...
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In cross-sectional research, a researcher compares multiple segments of the population at the same time. If they were interested in people's dietary habits, the researcher might directly compare different groups of people by age. Instead of following a group of people for 20 years to see how their dietary habits changed from decade to decade, the researcher would study a group of 20-year-old individuals and compare them to a group of 30-year-old individuals and a group of 40-year-old...
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