Table 4 Fit measures for all models

1. Unidimensional

0.843

0.774

0.846

0.848

0.125 (0.121, 0.128)

0.867 (0.818, 0.917)

2. Two-dimensional

0.931

0.898

0.927

0.929

0.086 (0.082, 0.090)

0.419 (0.386, 0.454)

3. Three dimensional

0.953

0.928

0.948

0.951

0.073 (0.069, 0.077)

0.301 (0.274, 0.331)

4. Unidimensional with correlated errors

0.969

0.938

0.965

0.967

0.068 (0.064, 0.073)

0.214 (0.191, 0.238)