A combination of weak housing sales, tighter lending and a slowing economy is putting a drag on residential home values throughout Pennsylvania.

Home prices in 15 of the state's 16 metropolitan areas are in a downward trend, according to a new report from the Keystone Research Center in Harrisburg.

Inflation-adjusted home prices in Pennsylvania fell by 7 percent between the second quarter of 2007 and the second quarter of this year. Home prices in this state have fallen for three straight quarters and are now lower than their levels in the second quarter of 2005, the KRC found.

Nationally, over that same period, the decline in home values was 9.5 percent.

"We warned back in January that the Pennsylvania housing market appeared to be following national trends," said Mark Price, a KRC labor economist and author of the report. "The findings of this report bear that out. Pennsylvania has not dodged the bullet."

The new report, titled "In the Eye of the Storm: An Update on Pennsylvania Housing Prices," shows home prices dropped the most in the Lebanon metropolitan area at 8.8 percent. But other regions such as Allentown-Bethlehem-Easton had the second sharpest decline at 6.9 percent.

Residential home prices also fell in Altoona, Erie, Harrisburg-Carlisle, Reading, Scranton/Wilkes-Barre, State College, Williamsport and Pittsburgh.

Johnstown was the only metropolitan area in the state, according to the KRC report, that experienced a price increase in the last three quarters.