Parents across the United States have a wide range of concerns about the safety of their children's lives online, finds a new report.

Eighty-one percent of parents report their children, ages 9 - 17, use the Internet and access Web sites without adult supervision.

Forty-six percent of parents report children ages 9 - 17, who access the Internet by themselves have their own social networking profiles on sites like Facebook, MySpace and BlackPlanet.

Among children, ages 13 - 17, who access the Internet, 66 percent have their own profiles, according to the report released by the C.S. Mott Children's Hospital National Poll on Children's Health.

Of parents with kids online, nearly two-thirds are concerned (32 percent very concerned) about online sexual predators.

Similarly, about two-thirds of parents are concerned about loss of privacy (22 percent very concerned) and about one-half (21 percent are very concerned) about their children viewing pornographic material.

On contrary, smaller proportions of parents are concerned about their online kids playing games (35 percent), being the victims of cyber bullying (31 percent), or gambling (17 percent).

"Parents are quite aware of some online safety risks but seem less aware about others," said Matthew Davis, director of the poll.

"We know from other studies that about one in seven children between the ages of 10 and 17 have received sexual solicitation over the Internet and about one in three children have been exposed to sexually explicit material.