Aims: In this study, we tested the validity of the Severity of Dependence Scale in detecting dependence behaviours in patients with chronic migraine and medication overuse (CM + MO) using the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV) and the Leeds Dependence Questionnaire as gold standard measures.
Methods: Four hundred and fifty-four patients with CM + MO filled in the Severity of Dependence Scale and the Leeds Dependence Questionnaire and underwent a psychological evaluation for the diagnosis of substance dependence according to the DSM-IV criteria.
Results: Sixty-nine percent of subjects (n = 313) presented substance dependence according to the DSM-IV criteria. These patients scored significantly higher than those without substance dependence in Severity of Dependence Scale total score ( = -3.29, = 0.001), and in items 1 ( = -2.44, = 0.015), 2 ( = -2.50, = 0.012), 4 ( = -2.05, = 0.04), and 5 ( = -3.39, = 0.001). Severity of Dependence Scale total score ( = 0.13, = 0.04, = 3.49, < 0.001) was a significant predictor for substance dependence. Receiver Operating Characteristic (ROC) curves showed that Severity of Dependence Scale discriminated patients with or without substance dependence.
Conclusion: Severity of Dependence Scale could represent an interesting screening tool for dependency-like behaviors in CM + MO patients.
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