Figure 1: A scatterplot of counts/min versus individual MET values for the 42 obesetoseverely obese subjects walking on a treadmill at 2–6 km/h. The bold line indicates the regression equation derived from the linear mixed model (METs = 2.700 + 4.663E − 4*counts/min + 3.943E − 8*counts/min^{2}). 
