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Table 4 Confirmatory factor analysis of the five versions of the Roland-Morris Disability Questionnaire tested in the present study (n = 545)

From: 15-item Roland-Morris Disability Questionnaire (RMDQ-15): structural and criterion validity on patients with chronic low back pain

Models

Chi-square/DF

CFI

TLI

RMSEA (90% CI)

SRMR

AIC

BIC

Model 1

3.99

0.952

0.947

0.078 (0.073, 0.083)

0.117

10,090.839

10,297.277

Model 2

3.23

0.968

0.964

0.064 (0.057, 0.071)

0.081

8629.743

8784.571

Model 3

3.02

0.972

0.969

0.061 (0.054, 0.068)

0.076

8320.427

8475.256

Model 4

3.61

0.980

0.975

0.069 (0.058, 0.081)

0.070

5056.193

5150.810

Model 5

2.38

0.988

0.986

0.050 (0.042, 0.059)

0.060

5519.272

5648.295

Model 6

2.86

0.981

0.977

0.059 (0.051, 0.066)

0.074

6332.057

6473.983

  1. DF Degrees of freedom, CFI Comparative fit index, TLI Tucker-Lewis Index, RMSEA Root mean square error of approximation, CI Confidence interval, SRMR Standardized root mean square residual, AIC Akaike information criterion, BIC Bayesian information criterion
  2. Model 1: Structure with one domain and 24 items [7]
  3. Model 2: Structure with one domain and 18 items [13]
  4. Model 3: Structure with one domain and 18 items [14]
  5. Model 4: Structure with one domain and 11 items [15]
  6. Model 5: Structure with one domain and 15 items
  7. Model 6: structure with two domains and 16 items [16]