Factor analysis of the DSM-IV abuse and dependence symptoms indicated that they comprise a single factor (RMSEA=0.06) that will be referred to as AUD severity. The first three eigenvalues were 4.81, 1.05, and 1.02 respectively, and the first factor accounted for 68.8% of the total variance. The factor structure was consistent across all samples and is consistent with previous reports of a single latent factor underlying AUDs 34.
