Psychometric Properties of the Nightmare Distress Questionnaire in Veterans with Posttraumatic Nightmares
Gina Fisher, Amber B. Cohen, Emina Prguda, Madeline Romaniuk
Behavioral Sleep Medicine September 12, 2026 DOI: 10.1080/15402002.2026.2729031 (opens in new tab)
Study at a glance
AI-extracted from the abstract| Characteristics | Psychometric validation study Peer reviewed |
|---|---|
| Sample size | 659 |
| Population | Australian Defence Force veterans, including a subsample with provisional PTSD diagnosis and trauma-related nightmares |
| Measures | Nightmare Distress Questionnaire (NDQ) |
| Topics | Dreaming |
| Key points | The Nightmare Distress Questionnaire showed a one-factor structure explaining 51.46% of variance, strong internal consistency, and evidence of convergent and divergent validity in veterans. NDQ scores were significantly higher among veterans with a provisional PTSD diagnosis than those without, suggesting the measure can differentiate veterans based on PTSD symptomatology. |
Abstract
Objectives The study examined the psychometric properties of the Nightmare Distress Questionnaire (NDQ) in veterans with a provisional posttraumatic stress disorder (PTSD) diagnosis and trauma-related nightmares.Method Participants were 659 Australian Defence Force veterans who completed online questionnaires for a larger study investigating military-civilian transition. Analyses included exploratory factor analysis, and evaluation of internal consistency and convergent and divergent validity in a subsample of 191 veterans meeting provisional PTSD diagnostic criteria and endorsing trauma-related nightmares. An independent samples t-test assessed discriminant validity, comparing NDQ scores between participants with (n = 280) and without (n = 379) a provisional PTSD diagnosis.Results Principal-axis factoring suggested a one-factor solution comprising 10 items that explained 51.46% of the variance in nightmare distress. The NDQ demonstrated strong internal consistency, and correlations with validated measures supported convergent and divergent validity. NDQ scores were significantly higher for veterans with a provisional PTSD diagnosis.Conclusions Findings offer initial evidence of the NDQ’s validity and reliability to assess trauma-related nightmare distress among veterans. We provide novel insights into the NDQ’s utility for researchers and clinicians working with veteran populations, including its ability to differentiate veterans based on PTSD symptomatology.