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Clifford L. Johnson
National Center for Health Statistics
130Publications
53H-index
39.2kCitations
Publications 130
Newest
Published on Jun 1, 2015in British Journal of Nutrition3.32
Christine M. Pfeiffer41
Estimated H-index: 41
(CDC: Centers for Disease Control and Prevention),
Maya Sternberg37
Estimated H-index: 37
(CDC: Centers for Disease Control and Prevention)
+ 9 AuthorsSedigheh Yamini6
Estimated H-index: 6
(CFSAN: Center for Food Safety and Applied Nutrition)
Serum and red blood cell (RBC) total folate are indicators of folate status. No nationally representative population data exist for folate forms. We measured serum folate forms [5-methyltetrahydrofolate (5-methylTHF), unmetabolized folic acid (UMFA), non-methyl folate (sum of THF, 5-formylTHF, 5,10-methenylTHF), and MeFox (5-methylTHF oxidation product)] by HPLC-MS/MS and RBC total folate by microbiologic assay in US persons ≥1 year (n ~7500) participating in the National Health and Nutrition Ex...
Published on Mar 1, 2014in The American Journal of Clinical Nutrition6.57
Namanjeet Ahluwalia4
Estimated H-index: 4
(CDC: Centers for Disease Control and Prevention),
Kirsten A. Herrick7
Estimated H-index: 7
(CDC: Centers for Disease Control and Prevention)
+ 1 AuthorsClifford L. Johnson53
Estimated H-index: 53
(CDC: Centers for Disease Control and Prevention)
The period from birth to 24 mo (B-24) is a critical phase in which nutrient requirements for growth and development are high and several transitions in food consumption practices occur. A few largescale national studies (eg, the Feeding Infants and Toddlers Study and Infant Feeding Practices Study) offer important insights into infant feeding practices and food consumption patterns in young children in the United States. The NHANES collects comprehensive cross-sectional data on the nutrition and...
Published on Jun 1, 2012in Journal of Nutrition4.42
Christine A. Swanson49
Estimated H-index: 49
(NIH: National Institutes of Health),
Michael B. Zimmermann66
Estimated H-index: 66
(ETH Zurich)
+ 17 AuthorsKathleen L. Caldwell30
Estimated H-index: 30
(CDC: Centers for Disease Control and Prevention)
The Office of Dietary Supplements (ODS) at the NIH sponsored a workshop on May 12‐13, 2011, to bring together representatives from various NIH institutes and centers as a first step in developing an NIH iodine research initiative. The workshop also provided an opportunity to identify research needs that would inform the dietary reference intakes for iodine, which were last revised in 2001. Iodine is required throughout the life cycle, but pregnant women and infants are the populations most at ri...
Published on Feb 8, 2012in JAMA51.27
Hubert W. Vesper28
Estimated H-index: 28
,
Heather C. Kuiper2
Estimated H-index: 2
+ 2 AuthorsJames L. Pirkle47
Estimated H-index: 47
Published on Jan 1, 2012in Food & Nutrition Research2.55
Christine M. Pfeiffer41
Estimated H-index: 41
(CDC: Centers for Disease Control and Prevention),
Rosemary L. Schleicher25
Estimated H-index: 25
(CDC: Centers for Disease Control and Prevention)
+ 1 AuthorsPaul M. Coates33
Estimated H-index: 33
(NIH: National Institutes of Health)
The National Health and Nutrition Examination Survey (NHANES) provides the most comprehensive assessment of the health and nutrition status of the US population. Up-to-date reference intervals on biomarkers and dietary intake inform the scientific and public health policy communities on current status and trends over time. The main purpose of dietary assessment methods such as the food-frequency questionnaire, food record (or diary), and 24-hr dietary recall is to estimate intake of nutrients an...
Published on Jul 1, 2011in The American Journal of Clinical Nutrition6.57
Elizabeth A. Yetley36
Estimated H-index: 36
,
Clifford L. Johnson53
Estimated H-index: 53
NHANES measured folate and vitamin B-12 status biomarkers, starting with serum folate from NHANES I (1974–1975) through 2010. Subsequent NHANES measured additional biomarkers [eg, red blood cell folate, serum vitamin B-12, total homocysteine (tHcy), methylmalonic acid, serum folic acid, and 5-methyltetrahydrofolic acid]. Examples of the uses of these data are wide ranging and include public policy applications, the derivation of reference intervals, and research. Periodically, the National Cente...
Published on Jul 1, 2011in The American Journal of Clinical Nutrition6.57
Elizabeth A. Yetley36
Estimated H-index: 36
(NIH: National Institutes of Health),
Christine M. Pfeiffer41
Estimated H-index: 41
(CDC: Centers for Disease Control and Prevention)
+ 30 AuthorsRamon Durazo-Arvizu41
Estimated H-index: 41
(LUC: Loyola University Chicago)
A roundtable to discuss the measurement of vitamin B-12 (cobalamin) status biomarkers in NHANES took place in July 2010. NHANES stopped measuring vitamin B-12–related biomarkers after 2006. The roundtable reviewed 3 biomarkers of vitamin B-12 status used in past NHANES—serum vitamin B-12, methylmalonic acid (MMA), and total homocysteine (tHcy)—and discussed the potential utility of measuring holotranscobalamin (holoTC) for future NHANES. The roundtable focused on public health considerations and...
Published on Jul 1, 2011in The American Journal of Clinical Nutrition6.57
Elizabeth A. Yetley36
Estimated H-index: 36
(NIH: National Institutes of Health),
Christine M. Pfeiffer41
Estimated H-index: 41
(CDC: Centers for Disease Control and Prevention)
+ 31 AuthorsR. Carmel28
Estimated H-index: 28
(Cornell University)
A roundtable to discuss the measurement of folate status biomarkers in NHANES took place in July 2010. NHANES has measured serum folate since 1974 and red blood cell (RBC) folate since 1978 with the use of several different measurement procedures. Data on serum 5-methyltetrahydrofolate (5MTHF) and folic acid (FA) concentrations in persons aged ≥60 y are available in NHANES 1999–2002. The roundtable reviewed data that showed that folate concentrations from the Bio-Rad Quantaphase II procedure (Bi...
Published on Jul 1, 2011in The American Journal of Clinical Nutrition6.57
Elizabeth A Yetley1
Estimated H-index: 1
(CDC: Centers for Disease Control and Prevention),
Paul M Coates1
Estimated H-index: 1
(CDC: Centers for Disease Control and Prevention),
Clifford L. Johnson53
Estimated H-index: 53
(CDC: Centers for Disease Control and Prevention)
A roundtable dialogue to discuss “NHANES Monitoring of Biomarkers of Folate and Vitamin B-12 Status” took place in July 2010. This article provides an overview of the meeting and this supplement issue. Although the focus of the roundtable dialogue was on the measurement of folate and vitamin B-12 status biomarkers in NHANES, this article also describes the relevance and importance of these issues for clinical and research laboratories. The roundtable identified the microbiological assay (MA) as ...
Published on May 1, 2011in Annals of Epidemiology2.55
Yoon Ss10
Estimated H-index: 10
(CDC: Centers for Disease Control and Prevention),
Margaret D. Carroll54
Estimated H-index: 54
(CDC: Centers for Disease Control and Prevention)
+ 1 AuthorsQiuping Gu15
Estimated H-index: 15
(CDC: Centers for Disease Control and Prevention)
Objectives This study assesses (1) the prevalence of ever having a blood test for cholesterol, (2) current practices of following advice from a health care professional to manage high cholesterol, and (3) the association between total serum cholesterol level and following the advice. Methods A total of 17,260 adults aged 20 and older participated in the interview and medical examination in National Health and Nutrition Examination Survey (1999–2006). Cholesterol management was examined among adu...
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