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Supplement

Zinc Intake of the U.S. Population: Findings from the Third National Health and Nutrition Examination Survey, 1988–1994¹

Ronette R. Briefel², Karil Bialostosky^*, Jocelyn Kennedy-Stephenson, Margaret A. McDowell^*, R. Bethene Ervin and Jacqueline D. Wright^*

^* National Center for Health Statistics, Centers for Disease Control and Prevention, Hyattsville, MD 20782 and TRW, Inc., Fairfax, VA 22033

²To whom correspondence should be addressed at Mathematical Policy Research, Inc., Washington, D.C. 20024-2512.

National survey data for 29,103 examinees in the third National Health and Nutrition Examination Survey were used to estimate mean and percentile distributions of dietary and total zinc intakes based on 24-h dietary recalls and vitamin/supplement use. Mean daily total intakes ranged from 5.5 mg in non–breast-feeding infants to 13 mg in adults and were higher in adolescent and adult males than in females (P < 0.01). Mean total zinc intakes (22 mg) were ~10 mg higher in pregnant and lactating females than in nonpregnant, nonlactating females of the same age. Mean total zinc intakes were 0.7 mg higher in adolescents (11.1 mg) and 2.5–3.5 mg higher in adults (13 mg) compared with mean dietary intakes, indicating the average contribution of supplements to total zinc intake. Mean total zinc intakes were significantly higher in non-Hispanic whites than in non-Hispanic blacks (P < 0.01) and Mexican Americans (P < 0.01) for men and women aged 51–70 y and 71 y due to higher zinc supplement use. The prevalence of zinc-containing supplements use ranged from 0.1% in infants to 20.5% in adults. "Adequate" zinc intake in this survey population was 55.6% based on total intakes of >77% of the 1989 recommended dietary allowance. Young children aged 1–3 y, adolescent females aged 12–19 y and persons aged 71 y were at the greatest risk of inadequate zinc intakes.

KEY WORDS: • zinc intake • diet • supplements • National Health and Nutrition Examination Survey (NHANES) • recommended dietary allowance (RDA)

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