A study carried on teenagers; show that there is a correlation between obesity and time spent on watching TV. The participants filled questionnaires relating to TV watching and time spent on computer use for 19 survey cycles and in a period of 57 months. The author tells us that during this time, the triceps and skinfold thickness were measured during every survey cycles. There were four screen time trajectory groups identified. During every survey cycle, the effect of screen time to percentage body fat was noted and modeled using linear regression