The documented rise in obesity as schoolchildren watch more TV appears also to be true for preschool youngsters, and is worse if they have a set in the bedroom, researchers said Monday.

The study was published in the June issue of “Pediatrics,” the journal of the American Academy of Pediatrics, and involved 2,761 white, black and Hispanic low-income adults who had preschool children.

It also found that children with a TV set in their bedroom watched 4.8 hours more of TV or videotapes per week than those without.