• Component Description
• Eligible Sample
• Interview Setting and Mode of Administration
• Quality Assurance & Quality Control
• Data Processing and Editing
• Analytic Notes
• Codebook
  • SEQN - Respondent sequence number
  • ECQ020 - Mother smoked when pregnant
  • ECD070A - Weight at birth, pounds
  • ECD070B - Weight at birth, ounces
  • WHQ030E - How do you consider your child's weight
  • MCQ080E - Your child was overweight
  • ECQ150 - Help your child control weight

NHANES National Youth Fitness Survey

2012-2012 Data Documentation, Codebook, and Frequencies

Early Childhood (Y_ECQ)

Data File: Y_ECQ.xpt

First Published: September 2013

Last Revised: NA

Component Description

The early childhood questionnaire (variable name prefix ECQ) includes smoking habits of the mother while she was pregnant with the participant, birth weight, and the proxy’s assessment of the participant’s current weight.

Eligible Sample

All survey participants were eligible. Proxy respondents answered the questions for participants aged 3 to 15 years.

Interview Setting and Mode of Administration

These questions were asked, in the home, by trained interviewers using the Computer-Assisted Personal Interviewing (CAPI) system.

For details on the administration of the Early Childhood (Y_ECQ) section, please refer to the NNYFS 2012 Interviewer Procedures Manual and the Early Childhood Sample Participant Questionnaire on the NNYFS website.

Quality Assurance & Quality Control

The CAPI system is programmed with built-in consistency checks to reduce data entry errors. CAPI also uses online help screens to assist interviewers in defining key terms used in the questionnaire.

For details on the quality control/quality assurance process for this component, please refer to the NNYFS 2012 Interviewer Procedures Manual on the NNYFS website (https://www.cdc.gov/nchs/nnyfs/manuals.htm.  

Data Processing and Editing

For ECD070A (weight at birth, pounds) and ECD070B (weight at birth, ounces), all responses of 13 pounds or over were collapsed into a single category, with ECD070A coded as “13” and ECD070B coded as “0.” This was done to protect the confidentiality of survey participants.

Analytic Notes

Please refer to the NNYFS Analytic Guidelines for further details on the use of sample weights and other analytic issues.

Codebook and Frequencies