A single-item, logistic regression analysis indicated that the IPDS is able to predict suicide intent (Wald χ2 = 5.04 P < 0.05) in chronic daily headache patients. Analyses indicated that the IPDS had good internal consistency (Cronbach alpha = 0.93 average inter-item correlation = 0.40), and good convergent validity, with moderate to strong associations with measures assessing emotional distress (BHS, r = 0.47 P < 0.0001 GMDS, r = 0.72 P < 0.001). Patients were administered the Beck Hopelessness Scale (BHS), a specific section of the Mini-International Neuropsychiatric Interview (MINI) assessing suicidal intent, the Gotland Male Depression Scale (GMDS), and a scale devised to measure the degree of disability caused by the headache. Inclusion criteria were, a diagnosis of chronic daily headache (illness duration >5 years). Participants were a convenience sample of 61 adult outpatients admitted to the Department of Medical Sciences of the Sant’Andrea Hospital in Rome, between September 2007 and May 2008. The goals of this study were to assess the validity and usefulness of a new scale and to assess disability in a sample of patients with chronic daily headache.
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