NCT03320109

Brief Summary

Serum 25(OH)D, dietary and supplemental vitamin D were shown to influence cognitive outcomes in large epidemiological studies. Sex/age-specific and race-specific associations of vitamin D status and intake were examined with longitudinal change in various cognitive domains in a large sample of ethnically and socio-economically diverse US urban adults. Two prospective waves of data from Healthy Aging in Neighborhoods of Diversity across the Life Span (HANDLS) study were used, specifically visit 1: 2004-2009 and visit 2: 2009-2013, mean follow-up time±SD: 4.64±0.93y. Cognitive performance was assessed using 11 test scores covering domains of global cognition, attention, learning/memory, executive function, visuo-spatial/visuo-construction ability, psychomotor speed and language/verbal. Serum 25(OH)D, vitamin D intake and use of supplements containing vitamin D were the key exposures. Multiple mixed-effects linear regression models were conducted, (N=1,231-1,803, k=1.5-2.0 observation/participant).

Trial Health

87
On Track

Trial Health Score

Automated assessment based on enrollment pace, timeline, and geographic reach

Enrollment
3,720

participants targeted

Target at P75+ for all trials

Timeline
Completed

Started Aug 2004

Longer than P75 for all trials

Geographic Reach
1 country

1 active site

Status
completed

Health score is calculated from publicly available data and should be used for screening purposes only.

Trial Relationships

Click on a node to explore related trials.

Study Timeline

Key milestones and dates

Study Start

First participant enrolled

August 18, 2004

Completed
8.9 years until next milestone

Primary Completion

Last participant's last visit for primary outcome

July 7, 2013

Completed
Same day until next milestone

Study Completion

Last participant's last visit for all outcomes

July 7, 2013

Completed
4.3 years until next milestone

First Submitted

Initial submission to the registry

October 20, 2017

Completed
5 days until next milestone

First Posted

Study publicly available on registry

October 25, 2017

Completed
Last Updated

October 25, 2017

Status Verified

October 1, 2017

Enrollment Period

8.9 years

First QC Date

October 20, 2017

Last Update Submit

October 20, 2017

Conditions

Outcome Measures

Primary Outcomes (1)

  • Cognitive change

    Annual rate of change in cognitive test scores spanning several domains of cognition

    Over a mean of 4.8 y

Interventions

Also known as: Serum 25(OH)D status and dietarysupplemental vitamin D

Eligibility Criteria

Age30 Years - 64 Years
Sexall
Healthy VolunteersYes
Age GroupsAdult (18-64)
Sampling MethodProbability Sample
Study Population

Serum 25(OH)D was lower among African-Americans who had a higher prevalence of vitamin D deficiency compared with Whites, in addition to consuming a smaller amount of vitamin D in the diet. Older participants tended to have a significant increase in serum 25(OH)D over time compared with younger men. Finally, older participants were more likely than younger men to be vitamin D-containing supplement users.

You may qualify if:

  • HANDLS initially recruited 3,720 participants (Phase I, visit 1). Given that only Phase II had in-depth data including biochemical indices and cognitive performance measures, 25(OH)D was available for 1,981 participants at baseline. The corresponding sample size for dietary and supplemental vitamin D were N=2,177 and N=2,159, respectively. Complete and reliable cognitive tests at each visit varied in sample size as well. Further, the final analytic sample was determined based on exposure and covariate non-missingness at baseline and outcome non-missingness at either visit. The final analytic sizes ranged between N=1,231 and N=1,803 with k=1.5-1.9 observation/participant.

You may not qualify if:

  • HANDLS participants with missing data on cognitive test score on both visits and/or missing data on exposure and covariates included in the mixed-effects regression models.

Contact the study team to confirm eligibility.

Sponsors & Collaborators

Study Sites (1)

Biomedical Research Center, NIA/NIH/IRP

Baltimore, Maryland, 21224, United States

Location

Related Publications (43)

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Related Links

MeSH Terms

Conditions

Cognitive Dysfunction

Interventions

Vitamin D

Condition Hierarchy (Ancestors)

Cognition DisordersNeurocognitive DisordersMental Disorders

Intervention Hierarchy (Ancestors)

SecosteroidsSteroidsFused-Ring CompoundsPolycyclic Compounds

Study Design

Study Type
observational
Observational Model
COHORT
Time Perspective
PROSPECTIVE
Sponsor Type
NIH
Responsible Party
PRINCIPAL INVESTIGATOR
PI Title
Staff Scientist

Study Record Dates

First Submitted

October 20, 2017

First Posted

October 25, 2017

Study Start

August 18, 2004

Primary Completion

July 7, 2013

Study Completion

July 7, 2013

Last Updated

October 25, 2017

Record last verified: 2017-10

Data Sharing

IPD Sharing
Will not share

Locations