Z-scores of the RAND-36 and MFI-20 questionnaires. Grey circles represent mean and SD of patients with normal androgen levels (n = 37) and black squares represent mean and SD of patients with androgen deficiency (n = 33). Mean population score is represented by a Z-score of zero. P < 0.05 is indicated with *. Note that higher Z-scores on the MFI-20 mean more fatigue and lower Z-scores on the RAND-36 signify poorer quality of life.