DOI: 10.3886/icpsr03605.v1
title: National Health Interview Survey, 2001
title: Version 1

description: The purpose of the National Health Interview Survey (NHIS)
is to obtain information about the amount and distribution of illness,
its effects in terms of disability and chronic impairments, and the
kinds of health services people receive. Implementation of a
redesigned NHIS, consisting of a basic module, a periodic module, and
a topical module, began in 1997 (See NATIONAL HEALTH INTERVIEW SURVEY,
1997 [ICPSR 2954]). The 2001 NHIS contains the Household, Family,
Person, Sample Adult, Sample Child, Child Immunization, and Injury and
Poison Episode data files from the basic module. Each record in the
Household-Level File (Part 1) contains data on type of living
quarters, number of families in the household responding and not
responding, and the month and year of the interview for each sampling
unit.
The Family-Level File (Part 2) is made up of reconstructed
variables from the person-level data of the basic module and includes
information on sex, age, race, marital status, Hispanic origin,
education, veteran status, family income, family size, major
activities, health status, activity limits, and employment status,
along with industry and occupation. As part of the basic module, the
Person-Level File (Part 3) provides information on all family members
with respect to health status, limitation of daily activities,
cognitive impairment, and health conditions. Also included are data on
years at current residence, region variables, height, weight, bed
days, doctor visits, hospital stays, and health care access and
utilization. A randomly-selected adult in each family was interviewed
for the Sample Adult File (Part 4) regarding respiratory conditions,
renal conditions, AIDS, joint symptoms, health status, limitation of
daily activities, and behaviors such as smoking, alcohol consumption,
and physical activity. Also included in this file are variables
pertaining to the Healthy People 2010 Objectives. The Sample Child
File (Part 5) provides information from an adult in the household on
medical conditions of one child in the household, such as respiratory
problems, seizures, allergies, and use of special equipment such as
hearing aids, braces, or wheelchairs. Also included are variables
regarding child behavior, the use of mental health services, and
Attention Deficit Hyperactivity Disorder (ADHD). The Child
Immunization File (Part 6) presents information from shot records and
supplies vaccination status, along with the number and dates of shots,
and information about the chicken pox vaccine. Episode-based
information regarding injuries and poisonings are found in the Injury
and Poison Episode File (Part 7), which examines the cause and date of
injury or poisoning, loss of time from work or school, and whether the
episode resulted in hospitalization. Information in the Injury and
Poison Verbatim File (Part 8) is comprised of narrative text
describing injuries, including type of injury, how the injury
occurred, and the body part injured.
description: The NHIS uses a stratified multistage probability design.
 The sample for the NHIS is redesigned every decade using population
 data from the most recent decennial census. A redesigned sample was
 implemented in 1995. This new design includes a greater number of
 primary sampling units (PSUs) (from 198 in 1994 to 358), and a more
 complicated nonresponse adjustment based on household screening and
 oversampling of Black and Hispanic persons, for more reliable
estimates of these groups.
description: Datasets: 
DS0: Study-Level Files
DS1: Household-Level File
DS2: Family-Level File
DS3: Person-Level File
DS4: Sample Adult File
DS5: Sample Child File
DS6: Child Immunization File
DS7: Injury and Poison Episode File
DS8: Injury and Poison Verbatim File
DS9: Codebook - Volume 1
DS10: Codebook - Volume II
DS11: Data Collection Instruments
DS12: Field Representative's Manual
description: Civilian, noninstitutionalized population of the 50 states
and the District of Columbia.
description: The data from the Household-Level File can be
merged with any of the other files, and other files can be merged as
well. For further information on merging data, consult the
codebook.The periodic module is not yet available from NCHS. When
released, it will provide more detailed information on topics
resulting from the basic module.To learn more about the National
Health Interview Survey (NHIS), visit the following Web site of the
Centers for Disease Control and Prevention (CDC):

https://www.cdc.gov/nchs/nhis/index.htm.Per agreement with
NCHS, ICPSR distributes the data files and text of the technical
documentation in this collection in their original form as prepared by
NCHS.The codebooks and data collection instruments are provided
by ICPSR as Portable Document Format (PDF) files. The PDF file format
was developed by Adobe Systems Incorporated and can be accessed using
PDF reader software, such as the Adobe Acrobat Reader. Information on
how to obtain a copy of the Acrobat Reader is provided on the ICPSR
Web site.