Shneidman's Psychological Pain Assessment Scale (PPAS) was explored for its validity and reliability. The test-retest reliability of the measures was quite modest for a 28-day interval. In a sample of undergraduate students, measures of psychache were significantly associated with prior suicidality; yet, the PPAS had only a modest degree of validity. More detailed study is warranted, before final conclusions can be made.
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Leenaars et al. (2005) studied this question.
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