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NHANES Dietary Web Tutorial

Estimate Population Mean Intakes

Purpose

One of the most frequently cited measures in dietary assessment is mean intake.  Because NHANES is a sample of the US population, weighted sample means are estimates of the population means.  This module covers the estimation of mean food intakes and the estimation of mean nutrient intakes.

 

Task 1: Estimate Mean Food Intakes

This task reviews the key concepts related to measurement error associated with mean food intakes and the need to group foods for analysis.  It also provides instructions on deriving means and standard errors, using intake of milk consumed as a beverage and total milk and milk products as examples.

 

Task 2: Estimate Mean Nutrient Intakes from Foods and Beverages

This task explains that nutrient intakes can be derived from dietary recalls, and discusses the measurement error associated with nutrient intakes estimated from dietary recalls.  It also provides details on how to derive means and standard errors, using intake of calcium from foods and beverages as an example.

 

Task 3: Estimate Mean Nutrient Intakes from Supplements

This task describes key concepts related to mean nutrient intake being derived from dietary supplements.  It also provides details on how to estimate population means and standard errors, using intake of calcium from supplements as an example.

 

Task 4: Estimate Mean Total Nutrient Intakes

This task provides key concepts regarding combining data from both dietary recalls and the supplement questions to derive total nutrient intake.  It also shows how to estimate population means and standard errors of total nutrient intake.

 

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