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Protocol - Weight - Self-Reported Weight

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Protocol Name from Source:

2007-2008 National Health and Nutrition Examination Survey (NHANES) Anthropometry Procedures Manual

Availability:

Publicly available

Description:

The respondent provides his/her self-reported weight.

Protocol:

The PhenX Anthropometrics Working Group strongly recommends the assessment of weight using a measured protocol. Self-reported weight should be collected only as a last resort.

There are several overarching, critical issues for high-quality data collection of anthropometric measures that optimize the data in gene-environment etiologic research. These issues include: 1) the need for training (and re-training) of study staff in anthropometric data collection; 2) duplicate collection of measurements, especially under field conditions; 3) use of more than one person for proper collection of measurements where required; 4) accurate recording of the protocols and measurement units of data collection; and 5) use of required and properly calibrated equipment.

Self-Reported Weight can be used in a personal or self-administered interview.

Self-Reported Weight*

*NOTE: Self-reported weight values are considered to be less accurate. Self-reported weight is subject to error and is used when measured weight cannot be obtained.

How much {do you/does the participant} weigh without clothes or shoes? [If {you are/she is} currently pregnant, how much did {you/she} weigh before your pregnancy?]

Personnel and Training Required

The trained interviewer should be able to administer a questionnaire and be able to probe for information as necessary.

Equipment Needs

None

Requirements

Requirement CategoryRequired
Average time of greater than 15 minutes in an unaffected individualNo
Major equipmentNo
Specialized requirements for biospecimen collectionNo
Specialized trainingNo

Mode of Administration

Self-administered

Life Stage:

Infant, Toddler, Child, Adolescent, Adult, Senior

Specific Instructions:

Measured weight is recommended, and self-reported weight should be recorded as a last resort only.* Please indicate how the weight was collected (i.e., measured vs. self-reported).

In instances where both self-reported and measured weight are collected, collect the self-reported weight before the measured weight.

When a woman is pregnant, her weight increases, and it is assumed that the information desired is her usual/nonpregnant weight. Thus, it is necessary to inquire whether a woman is pregnant, and if she is pregnant, to inquire about her weight before pregnancy as opposed to her actual/current weight.

*NOTE: Self-reported weight values are considered to be less accurate. Self-reported weight is subject to error and is used when measured weight cannot be obtained.

Research Domain Information

Release Date:

October 1, 2015

Definition

Current Weight - Measured Current measured weight is the weight of the participant in kilograms. Current Weight - Self-Reported* Self-reported weight is the weight in kilograms or pounds as reported by the participant.

*NOTE: Self-reported weight values are considered to be less accurate and are used only when measured weight cannot be obtained.

Purpose

Current weight is used to assess a child’s growth and development and an adult’s current health status. Overweight and obese status is associated with several serious comorbidities, including type 2 diabetes, cardiovascular disease, hypertension, and obstructive sleep apnea.

Selection Rationale

Weight measurements are used to calculate body mass index, assess nutritional status, and predict morbidity and mortality. Self-reported weight was included because it gives another way to monitor obesity (as used in Centers for Disease Control and Prevention studies). Note that the self-reported weight is less accurate than a measured weight and should be used only as a backup or a last resort.

Language

English, Spanish

Standards

StandardNameIDSource
Common Data Elements (CDE)Person Self-Report Weight Value2793247CDE Browser
Logical Observation Identifiers Names and Codes (LOINC)Self reported weight proto62298-5LOINC

Process and Review

The [link[phenx.org/node/62|Expert Review Panel #1]] reviewed the measures in the Anthropometrics, Diabetes, Physical Activity and Physical Fitness, and Nutrition and Dietary Supplements domains.

Guidance from the ERP includes:

• Added replicate measure language

• Changed unit of measurement

Back-compatible: no changes to Data Dictionary

Previous version in Toolkit archive ([link[www.phenxtoolkit.org/index.php?pageLink=browse.archive.protocols&id=20000|link]])

Source

Centers for Disease Control and Prevention, National Center for Health Statistics. (2007). National Health and Nutrition Examination Survey (NHANES) Anthropometry Procedures Manual. Hyattsville, MD: U.S. Department of Health and Human Services, Centers for Disease Control and Prevention.

Certification for the Spanish translation can be found here.

General References

None

Protocol ID:

21502

Variables:

Export Variables
Variable NameVariable IDVariable DescriptionVersiondbGaP Mapping
PX021502_Self_Reported_Weight_LbsPX021502010200How much {do you/does the participant} weigh without clothes or shoes? [If {you are/she is} currently pregnant, how much did {you/she} weigh before your pregnancy?]4N/A
PX021502_Self_Reported_Weight_KgsPX021502010100How much {do you/does the participant} weigh without clothes or shoes? [If {you are/she is} currently pregnant, how much did {you/she} weigh before your pregnancy?]4N/A