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Table 2 Item response characteristics for the three measures of suicidality

From: Suicidal ideation during treatment of depression with escitalopram and nortriptyline in Genome-Based Therapeutic Drugs for Depression (GENDEP): a clinical trial

  Discrimination parameter (α) Response option thresholds
   β1 β2 β3 β4 β5 β6
MADRS suicidality 7.1 0.03 0.8 1.53 1.93 2.57 2.97
HRSD-17 suicidality 6.1 0.4 1.26 1.99 3.11   
BDI suicidality 3.1 0.64 1.98 2.66    
  1. The threshold parameter β shows the standardised level of severity at which subsequent response options become more likely than the previous response option.
  2. BDI = Beck Depression Inventory; HRSD = Hamilton Rating Scale for Depression; MADRS = Montgomery-Asberg Depression Rating Scale.