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Table 2 Items wording and descriptive statistics, and internal consistency of the PHQ-9 and PHQ-2

From: The reliability and validity of the Patient Health Questionnaire-9 (PHQ-9) and PHQ-2 in patients with infertility

  Mean SD Corrected item total correlation Alpha if item deleted Cronbach’s Alpha
1 Little interest or pleasure in doing things 1.19 1.05 0.589 0.834  
2 Feeling down, depressed, or hopeless 1.22 1.01 0.698 0.822  
3 Trouble falling or staying asleep, or sleeping too much 1.12 1.10 0.561 0.837  
4 Feeling tired or having little energy 1.36 1.03 0.634 0.829  
5 Poor appetite or overeating 0.98 1.07 0.506 0.842  
6 Feeling bad about yourself – or that you are a failure 0.78 1.06 0.626 0.829  
7 Trouble concentrating on things 0.79 1.00 0.422 0.850  
8 Moving or speaking so slowly that other people could have noticed 0.68 0.99 0.597 0.833  
9 Thoughts that you would be better off dead or of hurting yourself 0.35 0.80 0.511 0.842  
PHQ-9 Total Score 8.47 6.17    0.851
PHQ-2 Total Score 2.42 1.86    0.767
  1. SD Standard deviation