Plutonium-244 fission tracks: an alternative explanation for excess tracks in lunar whitlockites.

tics do not require controls. Fortunately, however, Posavac provides us with a comparison between MMPI scores from both patients with pain and other medical patients. Note that his factor 1 is a manifest subjective distress factor, with very high loadings on depression (D), anxiety (Pt), confused thinking (Sc), and introversion (Si). This factor is not to be found in our patients with chronic pain and suggests a striking difference between the two groups. As further support for differences between the patient groups, we refer Posavac to a paper (5) (of which Swenson is a coauthor) which shows clear MMPI differences between pain patients and other medical patients. Merskey and Spear (6) review numerous similar findings. Wolff objects to our interpretation of factor 1. We quite agree with him that this factor is independent of the pain factor, and pointed this out. We also emphasized that the average scores on the scales comprising this factor were within normal limits; were they not, they would have suggested an interpretation of a psychoticism factor. However, the average scores were not "similar to those of the standardization healthy norm group." They are a standard deviation (on the average) above the mean, reflecting a distinct (albeit subclinical) difference from the healthy norm group. This supports our labeling and interpreting the cluster of scales