Medical Information Only. Consult your healthcare provider before considering clinical trial enrollment.
Mental Retardation: early-phase trial registry
A small indexed set (3 trials) with no open enrollment listed right now.
Corpus placement: #5,209 of 28,707 conditions by registered trial count.
3 US clinical trials · none currently recruiting · #5,209 of 28,707 conditions by registered trial count
Mental Retardation: 3 US clinical trials tracked, none currently recruiting.
Mental Retardation is the subject of 3 registered US clinical trials on ClinicalTrials.gov, none currently recruiting. 0 are in Phase 3-4 (later-stage) and 1 in Phase 1-2 (earlier-stage). The most active sponsor is National Human Genome Research Institute (NHGRI), running 2 of these trials.
Enrollment posture brief
Registry condition mental-retardation
OPEN 0 | RECR 0% | LATE 0 | EARLY 1 | RANK #5209 | SPON 2
Volume-matched condition peers
Nearest open-share peer: Accelerated Phase Chronic Myelogenous Leukemia (0% recruiting · 12 trials)
Mental Retardation has no open enrollment in this registry pull (3 archived studies). Peers show how other volume-matched labels compare on open share. How peer matching works →
Key findings
What ClinicalTrials.gov does not surface for Mental Retardation on its own pages , computed from the registry mirror as of 2026-08-08. Each line carries its own denominator so it can be quoted as it stands.
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Mental Retardation is recruiting below its size-band peers.
0 of 3 indexed trials (0%) are open to enrollment, against a 46.5% average across 27,806 conditions with fewer than 20 trials. The peer set uses the same ClinicalTrials.gov-derived counts as this page.
Indexed trials (enrollment closed)
3 total, page 1 of 1
Evaluation of Patients With Unresolved Chromosome Abnormalities
National Human Genome Research Institute (NHGRI)
NCT00001639
Healthy Lifestyles for People With Intellectual Disabilities
Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)
NCT00597948
Treatment Strategies for Children With Smith-Magenis Syndrome
National Human Genome Research Institute (NHGRI)
NCT00506259
Phase Distribution
| Phase | Trial count |
|---|---|
| Phase 1 | 1 |
Top Sponsors
Named interventions
Most-linked intervention names on Mental Retardation records (sponsor-reported on ClinicalTrials.gov). Counts are trial links, not unique products.
US sites by state
Facility locations filed on Mental Retardation trials. A trial with sites in several states counts in each.
Source: ClinicalTrials.gov, National Library of Medicine. Data is informational only.
Related
What to do with this Mental Retardation page
3 registered trials, 0 currently recruiting, is a starting point for a conversation, not a diagnosis or a recommendation.
- No Mental Retardation trials are currently recruiting in this registry; that can change as new trials post, or check the broader research index. Browse research indexes
- National Human Genome Research Institute (NHGRI) sponsors the most Mental Retardation trials on record, review their full trial history before evaluating a specific study. See National Human Genome Research Institute (NHGRI)'s trials
- Bring the specific trial ID (NCT number) to your own doctor before enrolling, this page is a directory, not medical guidance. Read the trial-finding guide
Trial and recruiting counts reflect ClinicalTrials.gov registry status as of the data vintage above; individual trial eligibility and enrollment status can change.
Every figure on PlainTrial is rendered directly from the ClinicalTrials.gov registry, no number is typed in by an editor. This Mental Retardation condition card totals 3 registered trials; most-linked intervention Melatonin CR; top US site state Maryland. See our editorial standards & corrections policy, the methodology behind these numbers, the data changelog, or report a data error.