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U.S. children are using mobile devices including smartphones, tablets...

U.S. children are using mobile devices including smartphones, tablets and iPod touches about five days a week out of seven, NPD said an online survey found. Their average sessions are lasting just under an hour, and there is an average…

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of 12 apps on such devices that kids have access to -- 88 percent of them acquired for free, the research company said. Gaming was by far the No. 1 type of app used by youngsters, followed by music and taking photos. There’s an average of 6.5 game applications on each mobile device, NPD said. Boys were more likely to be game players than girls (87 percent vs. 80 percent), while girls were more diversified in the apps they used and were likely to have more types of apps than boys, it said. “The wide variety and sheer volume of free entertainment content available for app devices is clearly having an impact on kids and the way they play,” said analyst Anita Frazier. She said many of the apps were used by children and abandoned after a short time. Games were the apps most often paid for, at 35 percent, followed closely by educational game and movie apps. The online survey was done March 6-21 and had 2,502 respondents, NPD said.