Serum Zinc Concentrations in the US Population Are Related to Sex, Age, and Time of Blood Draw but Not Dietary or Supplemental Zinc

Serum zinc concentration is used to assess the zinc status of populations. Cutoffs for serum zinc were developed on the basis of data from the second NHANES (1976–1980). The objective of this study was to evaluate serum zinc concentrations in the US population and to determine factors affecting seru...

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Published in:The Journal of nutrition 2018-08, Vol.148 (8), p.1341-1351
Main Authors: Hennigar, Stephen R, Lieberman, Harris R, Fulgoni, Victor L, McClung, James P
Format: Article
Language:English
Subjects:
Adolescent
Adult
Age
Age Factors
Aged
Aged, 80 and over
Anemia
Anemia - blood
Blood
Blood Specimen Collection - methods
Child
Children
Dependent variables
Diet
Dietary Supplements
Female
Females
Hemoglobin
Hemoglobins - metabolism
Humans
Hypoalbuminemia - blood
Male
Males
Mathematical analysis
Middle Aged
NHANES
Nutrition Surveys
Nutritional Status
plasma zinc
Populations
Pregnancy
Reference Values
Regression analysis
Regression models
Serum albumin
Sex
Sex Factors
United States - epidemiology
Young Adult
Zinc
Zinc - blood
Zinc - deficiency
zinc metabolism
zinc status
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description Serum zinc concentration is used to assess the zinc status of populations. Cutoffs for serum zinc were developed on the basis of data from the second NHANES (1976–1980). The objective of this study was to evaluate serum zinc concentrations in the US population and to determine factors affecting serum zinc with the use of NHANES 2011–2014. Serum zinc was determined in males and females aged ≥6 y with the use of NHANES 2011–2014 (n = 4347). Dietary zinc intake was determined, and factors affecting serum zinc were identified with the use of regression models adjusting for sex, age, fasting status, and time of blood draw. ORs were calculated to identify factors associated with the risk of being below the serum zinc cutoff, and the prevalence of low serum zinc in the US was calculated. P 
doi_str_mv 10.1093/jn/nxy105
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Cutoffs for serum zinc were developed on the basis of data from the second NHANES (1976–1980). The objective of this study was to evaluate serum zinc concentrations in the US population and to determine factors affecting serum zinc with the use of NHANES 2011–2014. Serum zinc was determined in males and females aged ≥6 y with the use of NHANES 2011–2014 (n = 4347). Dietary zinc intake was determined, and factors affecting serum zinc were identified with the use of regression models adjusting for sex, age, fasting status, and time of blood draw. ORs were calculated to identify factors associated with the risk of being below the serum zinc cutoff, and the prevalence of low serum zinc in the US was calculated. P < 0.01 was considered significant. Mean ± SE serum zinc concentrations in males and females were 84.9 ± 0.8 and 80.6 ± 0.6 μg/dL, respectively (P < 0.0001). Regression models with serum zinc as the dependent variable indicated that afternoon and evening blood draws (β = –9.7 and –15.3; P < 0.0001) were negatively associated with serum zinc concentrations and serum albumin (β = 16.1; P < 0.0001) and hemoglobin (β = 1.0; P = 0.0048) were positively associated with serum zinc concentrations. Hypoalbuminemia (OR = 11.2; 99% CI: 3.4, 37.3), anemia in females (OR: 3.4; 99% CI: 1.7, 6.9), and pregnancy (OR: 9.6; 99% CI: 2.9, 31.9) increased the odds of being below the serum zinc cutoff (P < 0.0001 for all). Zinc from diet or supplements did not affect serum zinc (P > 0.01). Approximately 3.8% of children (<10 y), 8.6% of males (≥10 y), and 8.2% of females (≥10 y) were below the serum zinc cutoff. Factors such as sex, age, and time of blood draw should be considered when using serum zinc concentration to determine the zinc status of a population. Caution is advised when interpreting serum zinc concentration in populations with a high prevalence of hypoalbuminemia or anemia. 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Cutoffs for serum zinc were developed on the basis of data from the second NHANES (1976–1980). The objective of this study was to evaluate serum zinc concentrations in the US population and to determine factors affecting serum zinc with the use of NHANES 2011–2014. Serum zinc was determined in males and females aged ≥6 y with the use of NHANES 2011–2014 (n = 4347). Dietary zinc intake was determined, and factors affecting serum zinc were identified with the use of regression models adjusting for sex, age, fasting status, and time of blood draw. ORs were calculated to identify factors associated with the risk of being below the serum zinc cutoff, and the prevalence of low serum zinc in the US was calculated. P < 0.01 was considered significant. Mean ± SE serum zinc concentrations in males and females were 84.9 ± 0.8 and 80.6 ± 0.6 μg/dL, respectively (P < 0.0001). Regression models with serum zinc as the dependent variable indicated that afternoon and evening blood draws (β = –9.7 and –15.3; P < 0.0001) were negatively associated with serum zinc concentrations and serum albumin (β = 16.1; P < 0.0001) and hemoglobin (β = 1.0; P = 0.0048) were positively associated with serum zinc concentrations. Hypoalbuminemia (OR = 11.2; 99% CI: 3.4, 37.3), anemia in females (OR: 3.4; 99% CI: 1.7, 6.9), and pregnancy (OR: 9.6; 99% CI: 2.9, 31.9) increased the odds of being below the serum zinc cutoff (P < 0.0001 for all). Zinc from diet or supplements did not affect serum zinc (P > 0.01). Approximately 3.8% of children (<10 y), 8.6% of males (≥10 y), and 8.2% of females (≥10 y) were below the serum zinc cutoff. Factors such as sex, age, and time of blood draw should be considered when using serum zinc concentration to determine the zinc status of a population. 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Cutoffs for serum zinc were developed on the basis of data from the second NHANES (1976–1980). The objective of this study was to evaluate serum zinc concentrations in the US population and to determine factors affecting serum zinc with the use of NHANES 2011–2014. Serum zinc was determined in males and females aged ≥6 y with the use of NHANES 2011–2014 (n = 4347). Dietary zinc intake was determined, and factors affecting serum zinc were identified with the use of regression models adjusting for sex, age, fasting status, and time of blood draw. ORs were calculated to identify factors associated with the risk of being below the serum zinc cutoff, and the prevalence of low serum zinc in the US was calculated. P < 0.01 was considered significant. Mean ± SE serum zinc concentrations in males and females were 84.9 ± 0.8 and 80.6 ± 0.6 μg/dL, respectively (P < 0.0001). Regression models with serum zinc as the dependent variable indicated that afternoon and evening blood draws (β = –9.7 and –15.3; P < 0.0001) were negatively associated with serum zinc concentrations and serum albumin (β = 16.1; P < 0.0001) and hemoglobin (β = 1.0; P = 0.0048) were positively associated with serum zinc concentrations. Hypoalbuminemia (OR = 11.2; 99% CI: 3.4, 37.3), anemia in females (OR: 3.4; 99% CI: 1.7, 6.9), and pregnancy (OR: 9.6; 99% CI: 2.9, 31.9) increased the odds of being below the serum zinc cutoff (P < 0.0001 for all). Zinc from diet or supplements did not affect serum zinc (P > 0.01). Approximately 3.8% of children (<10 y), 8.6% of males (≥10 y), and 8.2% of females (≥10 y) were below the serum zinc cutoff. Factors such as sex, age, and time of blood draw should be considered when using serum zinc concentration to determine the zinc status of a population. Caution is advised when interpreting serum zinc concentration in populations with a high prevalence of hypoalbuminemia or anemia. This trial was registered at http://www.isrctn.com as ISRCTN96013840.]]></abstract><cop>United States</cop><pub>Elsevier Inc</pub><pmid>29947812</pmid><doi>10.1093/jn/nxy105</doi><tpages>11</tpages><oa>free_for_read</oa></addata></record>
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ispartof The Journal of nutrition, 2018-08, Vol.148 (8), p.1341-1351
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subjects Adolescent
Adult
Age
Age Factors
Aged
Aged, 80 and over
Anemia
Anemia - blood
Blood
Blood Specimen Collection - methods
Child
Children
Dependent variables
Diet
Dietary Supplements
Female
Females
Hemoglobin
Hemoglobins - metabolism
Humans
Hypoalbuminemia - blood
Male
Males
Mathematical analysis
Middle Aged
NHANES
Nutrition Surveys
Nutritional Status
plasma zinc
Populations
Pregnancy
Reference Values
Regression analysis
Regression models
Serum albumin
Sex
Sex Factors
United States - epidemiology
Young Adult
Zinc
Zinc - blood
Zinc - deficiency
zinc metabolism
zinc status
title Serum Zinc Concentrations in the US Population Are Related to Sex, Age, and Time of Blood Draw but Not Dietary or Supplemental Zinc
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