Table 1.
Key internal consistency, structural, and concurrent validation analyses of the Intolerance of Uncertainty Scale–12.
| Study/ Author |
Sample | Concurrent validation measures | Internal consistency approach |
Modeling approach |
|---|---|---|---|---|
| Carleton, Norton, and Asmundson (2007) | Undergrad students: Regina sample (n = 254); Houston sample (n = 818) |
Beck Anxiety Inventory, Beck Depression Inventory, Generalized Anxiety Disorder Questionnaire–4, Penn State Worry Questionnaire |
Regina sample: Total IU α = .91, PIU α = .85, IIU α = .85; Houston sample: Not reported |
Separate CFAs for both samples |
| Carleton, Collimore, & Asmundson (2010) | Community sample (N = 286) | Anxiety Sensitivity Index–3, Brief Fear of Negative Evaluation Scale, Generalized Anxiety Disorder Assessment, Social Avoidance and Social Distress Scale, Social Interaction Phobia Scale, Positive and Negative Affect Schedule |
Total IU α = .92, PIU α = .87, IIU α = .90 |
Regression analyses |
| Khawaja & Yu (2010) | Clinical (GAD) sample (n = 50); Nonclinical sample (n = 57) |
Anxious Thoughts Inventory, Meta-Cognitions Questionnaire, Penn State Worry Questionnaire, State– Trait Anxiety Inventory |
Clinical sample: Total IU α = .87, PIU α = .86, IIU α = .72; Nonclinical sample: Total IU α = .92, PIU α = .86, IIU α = .89 |
Comparison of reliability estimates across samples |
| McEvoy & Mahoney (2011) | Treatment seeking sample with anxiety and depression (N = 463) |
Eyesenck Personality Questionnaire, Penn State Worry Questionnaire, Body Sensations and Agoraphobic Cognitions Questionnaires, Social Phobia Scale, Social Interaction Anxiety Scale, Padua Inventory, Beck Depression Inventory, Kessler Psychological Distress Scale |
Total IU α = .93, PIU α = .88, IIU α = .88 |
CFA |
| Fergus & Wu (2012) | Undergraduate students: White (n = 1,185); African American (n = 301) |
Penn State Worry Questionnaire | Not reported | Multiple groups CFA |
| Helsen et al. (2013) | Dutch undergraduate students: Calibration sample (n = 483); Validation sample (n = 483) |
Penn State Worry Questionnaire, Beck Depression Inventory, State–Trait Anxiety Inventory |
Total IU α = .83, PIU α = .78, IIU α = .72 (all based on total sample) |
Separate CFAs for both samples |
| Jacoby et al. (2013) | N = 205 patients with OCD | Yale–Brown OCD Scale, Dimensional OCD Scale, Obsessive Beliefs Questionnaire–44, Beck Depression Inventory |
Total IU α = .93, PIU α = .90, IIU α = .90 |
CFA |
Note. CFA = confirmatory factor analysis; IU = intolerance of uncertainty; PIU = prospective intolerance of uncertainty; IIU = inhibitory intolerance of uncertainty; GAD = generalized anxiety disorder; OCD = obsessive–compulsive disorder.