Table 3.
Standardized factor loadings for the 13 IBIP items in Study 2 and Study 3 confirmatory factor analyses.
| Study | |||||||
|---|---|---|---|---|---|---|---|
| Study 2 (analog EFA) | Study 3 (clinical CFA) | ||||||
| Sentence Stem | Threat Word | Factor | I β | HA β | Factor | I β | HA β |
| 1. A past memory suddenly comes to mind. | Scared | I/HA | .42* | .35* | -- | -- | -- |
| 2. A stranger behind you in line is close to you. | Agitated | HA | −.04 | .68* | HA | -- | .60* |
| 3. You have to read directions a second time. | Racing thoughts | HA | .09 | .47* | HA | -- | .47* |
| 4. You picture a scenario in your mind. | Upset | I/HA | .58* | .22* | -- | -- | -- |
| 5. You have memories about a place. | Horror | I | 1.04* | −.26* | I | .84* | -- |
| 6. You are reminded of a past event. | Distraught | I/HA | .56* | .25* | -- | -- | -- |
| 7. You think of someone you haven’t seen in a while. | Terror | I | .67* | .00 | I | .69* | -- |
| 8. You become frustrated. | Outburst | I/HA | .22* | .35* | -- | -- | -- |
| 9. You are invited to the movies but do not want to go. | Withdrawn | HA | .13 | .56* | HA | -- | .69* |
| 10. A conversation triggers a memory. | Traumatic | I | .79* | .05 | I | .77* | -- |
| 11. You think of a face you are familiar with. | Attacker | 1 | .64* | .01 | 1 | .73* | -- |
| 12. You are invited to a party. | Avoid | HA | −.01 | .68* | HA | -- | .73* |
| 13. You are in a public place. | Over-alert | HA | .07 | .73* | HA | -- | .77* |
Note. IBIP = 9-item Interpretation Bias Index for PTSD; I = 4-item IBIP ‘intrusions’ factor; HA = 5-item IBIP ‘hypervigilance/avoidance’ factor.
*
p < .01