# Validation Study: Mobile DSST on Cognition in Adults With MDD

> **NCT03999567** · NA · COMPLETED · sponsor: **Brain and Cognition Discovery Foundation** · enrollment: 30 (actual)

## Conditions studied

- Major Depressive Episode

## Interventions

- **OTHER:** Pen and Paper Digit Symbol Substitution Test (DSST)
- **OTHER:** Electronic Digit Symbol Substitution Test (DSST)- (a.k.a. Codebreaker)

## Key facts

- **NCT ID:** NCT03999567
- **Lead sponsor:** Brain and Cognition Discovery Foundation
- **Sponsor class:** OTHER
- **Phase:** NA
- **Study type:** INTERVENTIONAL
- **Status:** COMPLETED
- **Start date:** 2019-08-25
- **Primary completion:** 2020-02-04
- **Final completion:** 2020-02-04
- **Target enrollment:** 30 (ACTUAL)
- **Last updated:** 2020-07-08

## Collaborators

- [object Object]
- [object Object]
- [object Object]

## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT03999567

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT03999567, "Validation Study: Mobile DSST on Cognition in Adults With MDD". Retrieved via AI Analytics 2026-05-28 from https://api.ai-analytics.org/clinical/NCT03999567. Licensed CC0.

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