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. 2014 Dec 24;13:S109–S608. doi: 10.1111/j.1469-0691.2007.01733.x
Regions Pen I+R (%)
Net Gain/(Loss) (%)
1999–2000 n = 1948/4751 2004–2006 n = 873/2071
All regions 41.0 42.2 1.2
East North Central 38.7 41.7 3.0
East South Central 53.3 62.5 9.2
Middle Atlantic 36.9 37.6 0.7
Mountain 41.1 37.1 (4.0)
New England 26.1 35.1 9.0
Pacific 34.6 31.2 (3.4)
South Atlantic 47.9 45.3 (2.6)
West North Central 37.1 45.3 8.2
West South Central 47.5 45.1 (2.4)