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Table 2 Comparison of confirmatory factor model fit statistics

From: Evaluation of the Irritable Bowel Syndrome Quality of Life (IBS-QOL) questionnaire in diarrheal-predominant irritable bowel syndrome patients

Statistic Subscales only Hierarchical Orthogonal Bi-factor Oblique Bi-factor Single factor
χ2 2441.1 2616.9 2254.9 1923.3 3755.9
(df) (499) (519) (496) (468) (527)
AIC 2633.1 2768.9 2452.9 2193.3 3891.9
BIC 3075.7 3119.4 2909.3 2815.7 4205.5
GFI 0.8232 0.8088 0.8346 0.8616 0.7378
CFI 0.877 0.8671 0.8889 0.9073 0.7955
RMSEA 0.072 0.074 0.069 0.066 0.091
(95% CI) (0.070, 0.075) (0.071, 0.077) (0.066, 0.072) (0.063, 0.069) (0.089, 0.094)
Average Residual 0.0588 0.062 0.053 0.0448 0.0632
% of Residuals ≥ 0.1 or ≤ -0.1 18.7% 21.2% 16.0% 10.5% 20.0%
  1. Note: χ2 = Likelihood ratio χ2; df = χ2 degrees of freedom; AIC = Akaike’s Information Criterion (smaller is better); BIC = Schwartz’s Bayesian Information Criterion (smaller is better); GFI = Goodness-of-Fit Index (Acceptable fit > 0.9); CFI = Bentler’s Comparative Fit Index (Good fit > 0.9); RMSEA = root-mean-square error of approximation (Very good fit <0.05;Moderate fit between 0.05 and 0.1); CI = confidence interval.