To evaluate a link between childhood obesity and television viewing, researchers reviewed data from the Early Childhood Longitudinal Survey of 11,113 children attending kindergarten in 2011 to 2012. The analysis included the number of hours each child watched TV, how often he or she used computers, and the height and weight of the child. Twelve months later, researchers again evaluated 10,853 of the children. Again, parents were asked about time spent in front of the television and computer use. On average, researchers found that U.S. kindergartners watched an average of 3.3 hours of TV a day. Both kindergartners and first-graders who watched 1-2 hours or more than 2 hours of TV daily had significantly higher body mass indexes than those who watched less than 30 minutes or 30-60 minutes a day, even after adjusting for socioeconomic status, race/ethnicity and computer use. Part 3 tomorrow.