Fig. 2.

Measurement and structural components of the same first-order model of age- and sex-adjusted associations between cognitive domains and TMT-B completion time. (a) The measurement model describes the loadings of cognitive test scores on the cognitive domains – note that the factors are correlated but this is not indicated here (b) The structural aspect of the first-order model depicts associations between the cognitive domains (as measured in Fig. 2a) and TMT-B, as well as the correlations between latent factors. Paths with double headed arrows denote covariance between indicators. VPA = Verbal Paired Associates; NART = National Adult Reading Test; WTAR = Wechsler Test of Adult Reading; TOPF = Test of Premorbid Functioning.