This dissertation presents a longitudinal secondary data analysis, which utilizes an
ecological system perspective, under the theory of multifinality in developmental
psychopathology (Cicchetti & Rogosch, 1996). It tested the long term effects of adolescent
heavy gaming on the following outcomes: mental health outcome, including depression, conduct
disorder, and substance use disorder; health outcomes, including general health condition, Body
mass index and obesity; and education outcomes, including high school completion and total
years of school completed. The above outcomes will be tested for longitudinal association with
three different cut-off points of heavy gaming use as the independent variable.