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Global Severity Index. The Global Severity Index (GSI) represents the mean item score
and reflects the patient's overall level of symptomatic distress. Researchers have reported
a coefficient alpha of .95 and a test-retest reliability of .94 for the GSI of the SCL-90-R
(Edwards, Yarvis, Mueller, Zingale, & Wagman, 1978).
Participants were instructed to report how much discomfort a specific problem
has caused them during an indicated period of time, usually in the past seven days,
including that day. Items are rated on a Likert-type scale from 0 to 4, indicating,
respectively, not at all, a little bit, moderately, quite a bit, and extremely.
Inventory of Interpersonal Problems-64 (IIP; Horowitz, Rosenberg, Baer, Ureflo,
& Villasenor, 1988). The IIP-64 is a self-report, paper-and-pencil instrument, which
measures degree of interpersonal difficulty and social adjustment. The 64-item
questionnaire is set in Likert-type format, which reflects the degree of interpersonal
distress, the questionnaire consists of items that measure things the patient may "do too
much of' (e.g. I am too sensitive to criticism) and items that measure things that are
difficult for the patient (e.g. It is hard for me to trust other people). The IIP-64 is scored
based on the circumplex octants (arrogant-calculating; vindictive; cold; aloof-introverted;
unassured-submissive; exploitable; warm-agreeable; and gregarious-extroverted) on a
Likert-type scale from 0 to 4, with 0 representing not at all and 4 representing extremely.
Adequate psychometric properties have been demonstrated (Safran, Muran, & Winston,
1992), including an internal consistency of .88 and sub-scale alphas from .68 to .84. It
also has high test-retest consistency of .71 (Soldz, Budman, Demby, & Merry, 1995).
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