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

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

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

ISSN: 1471-230X