# Examine the Relationship Between Dietary Intake and Some Outcome Measure

### Purpose

The term “dietary intake” in this module will include foods and beverages reported on the 24-hour recalls. Researchers are often interested in relating an individual’s usual intake of dietary components to health parameters. Due to the different statistical properties of distributions for ubiquitously-consumed dietary constituents (i.e, nutrients and food groups consumed on a daily or almost daily basis), and episodically-consumed dietary constituents (i.e., nutrients and food groups that are not consumed every day for more than about 5% of the population), different models are fit for ubiquitously-consumed and episodically-consumed dietary constituents. This module will focus on using the method developed by researchers at NCI and elsewhere (the “NCI method”) for the case of ubiquitously- and episodically-consumed dietary constituents.

Many of the statistical methods used in this course are advanced, and may require consultation with a statistician. For modules 18-22, it is required that you have the statistical knowledge of mixed effects models, and program knowledge of calling in SAS macros. Since Module 18 provides the background information for Modules 19-22, it is advised that you carefully read Module 18 first before tackling other modules.

### Task 1: Describe Regression Calibration

This task provides an overview of regression calibration.

### Task 2: Examine the Relationship between Usual Intake of a Single Ubiquitously-consumed Dietary Constituent and Some Outcome

This task describes the use of statistical methods to estimate the individual-level predictions of a ubiquitously-consumed dietary constituent, such as a nutrient that is consumed daily, and relate this intake to a health parameter.

- Key Concepts about Examining the Relationship Between Usual Intake of a Single Ubiquitously-consumed Dietary Constituent and Some Outcome
- How to Examine the Relationship Between Usual Intake of a Single Ubiquitously-Consumed Dietary Constituent and Some Outcome
- Download Sample Code and Datasets

### Task 3: Examine the Relationship between Usual Intake of a Single Episodically-Consumed Dietary Constituent and Some Outcome

This task describes the use of statistical methods to estimate the individual-level predictions of an episodically-consumed dietary constituent, such as a food group that is not consumed every day, and relate intake to a health parameter, using the NCI method.

- Key Concepts about Examining the Relationship Between Usual Intake of a Single Episodically-consumed Dietary Constituent and Some Outcome
- How to Examine the Relationship Between Usual Intake of a Single Episodically-consumed Dietary Constituent and Some Outcome
- Download Sample Code and Datasets

##### Contact Us:

- National Center for Health Statistics

3311 Toledo Rd

Hyattsville, MD 20782 - 1 (800) 232-4636
- cdcinfo@cdc.gov