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, and attendance at preschool. 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
These questions were asked before the physical examination, in the home, using the Computer-Assisted Personal Interviewing-CAPI (interviewer administered) system.
For details on the administration of the Early Childhood (ECQ) section, please refer to the NHANES 2001-02 Interviewer Procedure Manuals and the Early Childhood Sample Person Questionnaire on the NHANES website.
Quality Assurance & Quality Control
For details on the QA/QC process for this component, please refer to the NHANES 2001-02 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 survey participant was born), any reported values over 44 years were coded as 45 years and older and any reported values under 15 years were coded as 14 years and younger. This was done to protect the confidentiality of participants.
Beginning in 2002, ECQ130 (hours spent away from home on a typical weekday) and ECQ140 (hours spent away from home on a typical weekend day) were no longer collected. ECQ130 and ECQ140 data from 2001 are not included in this data release file but can be accessed at the NCHS Research Data Center.
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.