note: demt2 omitted because of collinearity
note: demt3 omitted because of collinearity
note: demt4 omitted because of collinearity
note: demt5 omitted because of collinearity
note: demt6 omitted because of collinearity
note: demt7 omitted because of collinearity
note: demt8 omitted because of collinearity
note: demt9 omitted because of collinearity
note: demt10 omitted because of collinearity
note: demt11 omitted because of collinearity
note: demt12 omitted because of collinearity
note: demt13 omitted because of collinearity
note: demt14 omitted because of collinearity
note: demt15 omitted because of collinearity