Something that strikes me as strange about the SF-36 PF10 is that the possible scores are 0,5,10,15,20...100.
On the 10 questions you get 0 points for "limited a lot," 5 points for "limited a little," and 10 points for "not limited at all." Thus, the lower the score, the more limited you are.
But... is the interval between "not limited at all" and "limited a little" really the equivalent of the interval between "limited a little" and "limited a lot"? It doesn't seem like a very linear scale.
Since the difference between the GES and control groups was equivalent to one interval on one question out of the 10, it would be nice to know if that interval was between none and a little or a little and a lot.