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Table 4 Exploratory factor analysis for the developed PHQ-8

From: Developing the Patient Health Questionnaire-8 for a greater impact on the quality of life of patients with functional dyspepsia compared to Somatic Symptom Scale-8

Items Factor 1 Factor 2 Factor 3
Feeling tired or having low energy 0.802   
Fatigue 0.769   
Insomnia or trouble sleeping 0.525   
Dizziness 0.482   
Back pain   0.797  
Pain in arms, legs, or joints   0.719  
Throat discomfort    0.728
Dry mouth    0.706
  1. PHQ-8 Patient Health Questionnaire-8
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