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Table 2 PHQ-8 developed by screening 25 items using four methods

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 Degree of dispersion Correlation coefficient Factor analysis Cronbach’s α coefficient
Back pain 0.679 0.427 0.722 0.746
Pain in arms, legs, or joints 0.557 0.403 0.673 0.746
Dysmenorrhea or menstrual other discomfort 0.464(×) 0.243(×) 0.617 0.754(×)
Headaches 0.577 0.403 0.380(×) 0.746
Chest pain 0.496(×) 0.395 0.362(×) 0.745
Shortness of breath 0.497(×) 0.448 0.427 0.742
Dizziness 0.581 0.490 0.650 0.739
Fainting 0.112(×) 0.090(×) 0.609 0.755(×)
Palpitation 0.480(×) 0.386 0.514 0.746
Sexual pain or other discomfort 0.294(×) 0.313 0.511 0.749
Feeling tired or having low energy 0.687 0.543 0.731 0.735
Insomnia or trouble sleeping 0.694 0.378 0.623 0.751
Numbness/tingling 0.470(×) 0.341 0.731 0.749
Fatigue 0.628 0.509 0.780 0.738
Throat discomfort 0.763 0.457 0.434 0.746
Dry mouth 0.674 0.375 0.636 0.751
Excessive sweat 0.466(×) 0.296(×) 0.757 0.751
Hand/foot heavy feeling 0.364(×) 0.322 0.409 0.749
A burst of cold/fever 0.447(×) 0.464 0.505 0.741
Memory loss/forgetfulness 0.493(×) 0.415 0.724 0.744
Urinary frequency 0.449(×) 0.364 0.717 0.747
Urinary pain/dysuria 0.242(×) 0.260(×) 0.740 0.751
Blurred vision 0.419(×) 0.309 0.739 0.750
Neck and shoulder pain 0.487(×) 0.382 0.645 0.746
Muscle pain 0.374(×) 0.396 0.729 0.745
  1. PHQ-8 Patient Health Questionnaire-8, × indicated that the item was removed
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