... Other studies have offered support for a 4-factor model with a single higher order factor (Adornetto et al. 2008;Silverman et al. 2003) ( Table 1). These results were confirmed by Bernstein et al. (2007) using a taxometric approach, where it was found that the 4-factor model fits well when examining the normative form of anxiety sensitivity but that a unidimensional structure held better for more extreme forms , 4, 6, 7, 8, 9, 10, 11, 13, 14, 16, 18 3, 4, 6, 7, 8, 9, 10, 13, 14, 18 1, 5, 17 2, 11, 12, 15, 16 Silverman et al. (1999) Nonclinical sample: N=249 Social concerns Mental incapacitation concerns Control CASI 3 , 6, 9, 11, 14, 16, 18 1, 17 2, 12, 13, 15 4, 5, 7, 8, 10 Silverman et al. (2003) 3, 4, 6, 7, 8, 9, 10, 11, 13, 14, 16, 18 1, 5, 17 2, 12, 15 of anxiety sensitivity. Finally, across these existing studies, the identified factors (e.g. ...