Month 1, every additional TD brings 0.179 units of increase in GSI As you go from Month 1 to Month 2, you see an increase of 3.54 in the intercept for GSI, when TD = 0 As you go from Month 1 to Month 2, subtract 0.054 from the base slope. In Month 2, for every additional unit of TD, you are getting 0.054 fewer units of increase in GSI 0.179 – 0.054 = 0.125 In Month 2, for every additional unit of TD, you get 0.125 units of GSI