Title: Early Childhood
Contact Number: 1-866-441-NCHS
Years of Content: 2007
First Published: September, 2009
Access Constraints: None
Use Constraints: None
Geographic Coverage: National
Subject:Personal interview data for children, including birth weight, age of mother at birth, mother smoking during pregnancy, and Head Start attendance.
Record Source: NHANES 2007
Survey Methodology: NHANES 2007
is a stratified multistage probability sample of the civilian non-institutionalized population of the U.S.
Medium: NHANES Web site; SAS transport files
The Early Childhood section of the Sample Person Questionnaire (variable name prefix ECQ) provides personal interview data for children, including the age of the biological mother when the child survey participant was born, smoking habits of the mother while she was pregnant with the participant, birth weight, the proxy’s assessment of the participant’s weight, and attendance at Head Start. Many of the questions were included in NHANES III.
The target sample for the questions in this section is persons from birth to 15 years of age. However, target samples for some questions in this section vary. Please review the codebook carefully. Frequency counts were verified during the preparation of the file.
Interview Setting and Mode of Administration
The questions were asked in the household interview, using an interviewer-administered Computer Assisted Personal Interviewing (CAPI) system.
For details on the administration of the Early Childhood (ECQ_E) section, please refer to the NHANES 2007-08 Interviewer Procedure Manuals and the Early Childhood Sample Person Questionnaire on the NHANES 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 NHANES 2007-08 Interviewer Procedure Manuals on the NHANES website.
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.
For ECD010 (age of biological mother when the survey participant was born), any reported values under 14 years were coded as 14 years and younger. This was done to protect the confidentiality of participants.
Frequency counts were verified during the preparation of the file.
Although data in this file were collected as part of the household questionnaire, if they are merged with the MEC exam data, exam sample weights should be used for the analyses.
Please refer to the Analytic Guidelines for further details on the use of sample weights and other analytic issues. The Analytic Guidelines are available on the NHANES website.