According to a new survey from Common Sense Media and SurveyMonkey, 47% of parents worry their child is addicted to their mobile device. By comparison, only 32% of parents say they're addicted themselves. USA Today reports: Half of parents also say they are at least somewhat concerned about how mobile devices will affect their kids' mental health. Nearly one in five say they're "extremely" or "very" concerned. According to the survey, 89% of parents believe it's up to them to curb their children's smartphone usage. The survey conducted between Jan. 25 and Jan. 29 included a sample of 4,201 adults, including 1,024 parents with children under age 18. Data was weighted to reflect the demographic composition of the U.S. for adults over 18, based on Census data. Many devices and services feature parental controls, but some parents may not be aware they exist. The Common Sense-SurveyMonkey survey found 22% of parents did not know YouTube -- which has faced scrutiny over how easy it is for kids to find inappropriate videos -- offered parental controls. Also, 37% have not used the controls before. Among parents surveyed who say their kids watch YouTube videos, 62% said their kids have seen inappropriate videos on the site. Most, or 81%, said it's the parents' job to prevent kids from seeing these videos.