# Johnston County ADHD Study: Environmental, Reporductive, and Familial Risk Factors for Attention-Deficit Hyperactivity Disorder (ADHD)

> **NCT00339729** · — · COMPLETED · sponsor: **National Institute of Environmental Health Sciences (NIEHS)** · enrollment: 8000 (—)

## Conditions studied

- Attention-Deficit Hyperactivity Disorder

## Interventions

_None listed._

## Key facts

- **NCT ID:** NCT00339729
- **Lead sponsor:** National Institute of Environmental Health Sciences (NIEHS)
- **Sponsor class:** NIH
- **Phase:** —
- **Study type:** OBSERVATIONAL
- **Status:** COMPLETED
- **Start date:** 1997-05-07
- **Primary completion:** —
- **Final completion:** 2007-05-24
- **Target enrollment:** 8000 (—)
- **Last updated:** 2017-07-02


## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT00339729

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT00339729, "Johnston County ADHD Study: Environmental, Reporductive, and Familial Risk Factors for Attention-Deficit Hyperactivity Disorder (ADHD)". Retrieved via AI Analytics 2026-07-25 from https://api.ai-analytics.org/clinical/NCT00339729. Licensed CC0.

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