# Test-Retest Reliability of the German Version of the Headache Disability Questionnaire (HDQ).

> **NCT04877561** · — · UNKNOWN · sponsor: **Zurich University of Applied Sciences** · enrollment: 30 (estimated)

## Conditions studied

- Headache Disorders

## Interventions

_None listed._

## Key facts

- **NCT ID:** NCT04877561
- **Lead sponsor:** Zurich University of Applied Sciences
- **Sponsor class:** OTHER
- **Phase:** —
- **Study type:** OBSERVATIONAL
- **Status:** UNKNOWN
- **Start date:** 2021-06-01
- **Primary completion:** 2022-07-31
- **Final completion:** 2022-09-30
- **Target enrollment:** 30 (ESTIMATED)
- **Last updated:** 2021-05-12


## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT04877561

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT04877561, "Test-Retest Reliability of the German Version of the Headache Disability Questionnaire (HDQ).". Retrieved via AI Analytics 2026-05-28 from https://api.ai-analytics.org/clinical/NCT04877561. Licensed CC0.

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