Start-up funding by angel investors climbed 3.1 percent in the first half of the year compared with the same period in 2011, according to the Center for Venture Research at the University of New Hampshire.

Angel investors, who typically make small seed investments into early-stage companies, made a total of $9.2 billion in funding deals during the first two quarters of 2012, according to the center, which tracks the angel market.

The center also found that the average deal size for angels is $336,390 with health care and medical device businesses attracting the most funding. Angels also helped create 106,400 new jobs in the US this year, the center said.

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