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Table 6 Results of confirmatory factor analysis of the developed PHQ-8 and the SSS-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

Scale Model χ2 df RMR RMSEA GFI AGFI CFI TLI NFI
PHQ-8 3 factors 31.247 17 0.016 0.042 0.984 0.967 0.958 0.931 0.915
SSS-8 3 factors 17.251 17 0.010 0.007 0.991 0.981 0.998 0.997 0.927
  1. PHQ-8 Patient Health Questionnaire-8, SSS-8 Somatic Symptom Scale-8, RMR root mean square residual, RMSEA root mean square error of approximation, GFI goodness-of-fit index, AGFI adjusted goodness-of-fit index, CFI comparative fit index, TLI Tucker–Lewis index, NFI normed fit index
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