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Table 2 Corrected item-total correlations and Cronbach’s α when an item is deleted from the PHQ-9

From: Validation of the Patient Health Questionnaire-9 (PHQ-9) and PHQ-2 in patients with migraine

  Corrected item-total correlation Cronbach’s α if an item deleted
Item 1 0.734 0.876
Item 2 0.667 0.881
Item 3 0.563 0.892
Item 4 0.727 0.876
Item 5 0.713 0.878
Item 6 0.716 0.878
Item 7 0.607 0.886
Item 8 0.607 0.887
Item 9 0.641 0.885
  1. PHQ-9 Patient Health Questionnaire-9