The Simple Linear Regression relationships of Systolic Blood Pressure (SBP) on Age (in years) yields the following fitted model SBP The interpretation of the intercept (if any) is that = 199.30 + 1.62 Agei. a unit increase in Age is associated with SBP on average increasing by 1.62 unit. at zero Age the average SBP of individuals in the samples data is 199.30. at Age of 1 year the average SBP of individuals in the samples data is 199.30. Mathematically, at zero Age the average SBP of individuals in the samples data is 199.30. However, the intercept, although mathematically needed, should not be interpreted in this scenario because the average SBP of individuals of age zero holds no meaning in the context of this question.