A researcher wants to evaluate whether there is an association between total serum cholesterol (considered the outcome variable) and two potential risk factors: current smoking status (current smoker vs non-smoker) and body mass index, kg/m2. The multiple linear regression model is estimated as follows: expected total cholesterol = 205.5 – 2.82 Current smoker + 1.28 BMI. Which of the following is not true?
A) Current smokers have lower total serum cholesterol levels, on average, than non-smokers adjusted for BMI.
B) On average, current smokers have lower total serum cholesterol levels than non-smokers, by 2.82 mg/dL, adjusting for BMI.
C) The expected total serum cholesterol level for a non-smoker is 205.5 mg/dL.
D) BMI is positively associated with total serum cholesterol, adjusting for current smoking status.