How is the pull tension in PCMT calculated since the weight of the head of every individual is different?

all of the physics calculations performed in the software are based on averages and assumptions. We know the average weight of the head is 11 pounds so that is the figure used in some of the calculations. Based on the results of the distance between the ear and the shoulder we can also average the length of the neck, which is another factor in our calculations. So when you’re describing the results of the additional forces or the pcmt use the word" about" when describing their results.