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. Author manuscript; available in PMC: 2010 Jan 1.
Published in final edited form as: Drug Alcohol Depend. 2008 Oct 19;99(1-3):296–308. doi: 10.1016/j.drugalcdep.2008.09.001

Table 1.

Results from confirmatory factor analysis of 7 DSM-IV criteria, 7 mFTQ items, and 14 NDSS a items to assess an unidimensional, a multidimensional (three factors), and a hierarchical bifactor model in which a general factor is evaluated along with three orthogonal factors representing DSM-IV, mFTQ, and NDSS item groups.

Model A Model B Model C
Wave 3 Unidimensional Multidimensional Hierarchical
CFI 0.935 0.952 0.967
TLI 0.951 0.965 0.975
RMSEA 0.073 0.062 0.052
Wave 4
CFI 0.902 0.926 0.948
TLI 0.925 0.943 0.959
RMSEA 0.082 0.071 0.060
Wave 5
CFI 0.936 0.957 0.969
TLI 0.950 0.967 0.975
RMSEA 0.074 0.061 0.052
a

Three NDSS items were excluded from the analysis. CFI = Comparative Fit Index; TLI = Tucker Lewis Index; RMSEA= Root Mean Square Error of Approximation.