NHIS – About the National Health Interview Survey

NHIS Brochure pdf icon [ PDF – 1 MB ]
2019 Questionnaire Redesign
The National Health Interview Survey ( NHIS ) is the principal source of information on the health of the civilian noninstitutionalized population of the United States and is one of the major data collection programs of the National Center for Health Statistics ( NCHS ) which is character of the Centers for Disease Control and Prevention ( CDC ). The National Health Survey Act of 1956 provided for a continuing view and extra studies to secure accurate and current statistical information on the measure, distribution, and effects of illness and disability in the United States and the services rendered for or because of such conditions. The survey referred to in the Act, now called the National Health Interview Survey, was initiated in July 1957. Since 1960, the review has been conducted by NCHS, which was formed when the National Health Survey and the National Vital Statistics Division were combined.

The chief objective of the NHIS is to monitor the health of the United States population through the collection and analysis of data on a broad range of health topics. A major military capability of this surveil lies in the ability to categorize these health characteristics by many demographic and socioeconomic characteristics .
NHIS data are used widely throughout the Department of Health and Human Services ( HHS ) to monitor trends in illness and disability and to track advance toward achieving home health objectives. The data are besides used by the populace health research community for epidemiologic and policy analysis of such timely issues as characterizing those with respective health problems, determining barriers to accessing and using appropriate health care, and evaluating Federal health programs .
While the NHIS has been conducted continuously since 1957, the content of the view has been updated about every 15-20 years to incorporate advances in survey methodology and coverage of health topics. In January 2019, NHIS launched a redesigned content and structure that differs from its previous questionnaire design ( 1997–2018 ) .

Sample Design

NHIS is a cross-section family interview sketch. The target population for the NHIS is the civilian noninstitutionalized population residing within the 50 states and the District of Columbia at the time of the interview. The NHIS universe includes residents of households and noninstitutional group quarters ( for example, homeless shelters, rooming houses, and group homes ). Persons residing temporarily in scholar dormitories or irregular caparison are sampled within the households that they reside in permanently. Persons excluded from the universe are those with no cook family address ( for example, homeless and/or transient persons not residing in shelters ), active duty military personnel and civilians living on military bases, persons in long-run concern institutions ( for example, nursing homes for the aged, hospitals for the chronically ill or physically or intellectually disable, and wards for pervert or neglected children ), persons in correctional facilities ( for example, prisons or jails, juvenile detention centers, and halfway houses ), and U.S. nationals living in foreign countries. While active-duty Armed Forces personnel can not be sampled for inclusion in the surveil, any civilians residing with Armed Forces personnel in non-military housing are eligible to be sampled .
Because the NHIS is conducted in a face-to-face consultation format, the costs of interviewing a big dim-witted random sample of households and noninstitutional group quarters would be prohibitive ; randomly sampled dwelling units would be excessively dispersed throughout the state for cost-efficient interview. To keep surveil operations manageable, cost-efficient, and timely, the NHIS uses geographically clustered sampling techniques to select the sample of dwelling units for the NHIS. The sample distribution is designed in such a direction that each month ’ sulfur sample is nationally representative. Data collection on the NHIS is continuous, i, from January to December each class .
The sampling design is redesigned after every decennial census. A new sample plan for the 2016–2025 NHIS was designed with results of the 2010 decennial census. commercial address lists are used as the independent reservoir of addresses, supplemented by field list. Beginning in 2019, the sample is expected to yield 30,000 sample adult and 9,000 sample child completed interviews. The annual sample size can be reduced for budgetary reasons or increased when auxiliary financing is available .

2019 NHIS Questionnaire Redesign

The subject and structure of the NHIS were updated in 2019 to better meet the needs of datum users. Aims of the questionnaire redesign were to improve the measurement of embrace health topics, reduce respondent burden by shortening the length of the questionnaire, harmonize overlapping message with other federal health surveys, establish a long-run social organization of ongoing and periodic topics, and incorporate advances in survey methodology and measurement.

One “ sample adult ” aged 18 years or older and one “ sample child ” aged 17 years or younger ( if any children live in the family ) are randomly selected from each family following a brief initial interview that identifies everyone who normally lives or stays in the family. information about the sample adult is collected from the sample pornographic herself or himself unless she or he is physically or mentally unable to do so, in which case a intimate proxy can answer for the sample adult. data about the sample child is collected from a parent or adult who is intimate about and responsible for the health care of the sample child. This respondent may or may not besides be the sample pornographic .
From 1997-2018, the NHIS besides included a class questionnaire. Questions from the family questionnaire, including questions on health insurance and unmet needs for medical caution, were answered by a member of the class on behalf of all members of the family. In the redesign review, a lot of the subject that was collected about the sample pornographic and sample child in the syndicate section is now collected within the sample adult and sample child questionnaires, from the sample adult or sample child ’ mho respondent rather than another class penis. Sample adults may give different answers about themselves than would a syndicate extremity responding for them, and this could impact view estimates .
The elimination of the family questionnaire in 2019 was one part of an attempt to shorten the duration of the questionnaire. In addition, questions on rare conditions or military service use ( those with less than a 2 % prevalence ), questions on topics that were no longer priorities, and questions that were rarely used in analysis were dropped. A structure of annual and rotating message was besides implemented in 2019. The annual core contains the same questions from year to year, and these questions focus on demographic characteristics, health policy, chronic conditions, health care access and use, health-related behaviors, and serve and disability. The rotating core consists of questions that will be included in the interview sporadically and include expanded content on mental health, serve use, preventive services, health-related behaviors, injuries, and chronic annoyance. The cyclicity of questions in the rotate congress of racial equality varies by question and may be every-other year, once-every-three years, or two-out-of-three years .
As a result of dropping questions and putting others on a turn out agenda, along with the accession of newfangled questions reflecting raw priorities, the question orderliness and the context of most questions ( that is, the questions that come immediately before ) changed with the questionnaire redesign. These changes can affect how subsequent questions are interpreted and responded to, and these effects could impact sketch estimates. Data users looking at trends before and after the questionnaire redesign should carefully consider the impact of these changes .

Data Collection Procedures

The U.S. Census Bureau, under a contractual agreement, is the data collection agent for the National Health Interview Survey. NHIS data are collected endlessly throughout the year by Census interviewers. nationally, about 750 interviewers ( besides called “ Field Representatives ” or “ FRs ” ) are trained and directed by health survey supervisors in the U.S. Census Bureau Regional Offices to conduct interviews for NHIS .
The NHIS is conducted using computer-assisted personal interview. face-to-face interviews are conducted in respondents ’ homes, but follow-ups to complete interviews may be conducted over the telephone. A telephone interview may besides be conducted when the respondent requests a telephone consultation or when road conditions or travel distances would make it difficult to schedule a personal visit before the want completion date. In 2019, 34.3 % of the Sample Adult interviews and 31.7 % of the Sample Child interviews were conducted at least partially by telephone.

Availability of the Data

information from NHIS is made available through an across-the-board serial of NCHS Data Briefs, National Health Statistics Reports, MMWR Quickstats, and publications and articles in scientific and technical foul journals. Selected estimates are besides available as depart of an synergistic data question arrangement that provides tables and charts. These estimates are available for the nation as a hale and for selected subgroups defined by characteristics such as sex, age, race, ethnicity, family income, and area of the United States .
For data users and researchers throughout the populace, surveil data files are available on the internet. Analysts are reminded that NHIS is a sample survey. That is, alone a sample ( subset ) of the civilian noninstitutionalized population is selected to participate in the view. Sampling weights must be used to produce representative national estimates. More information for analysts about the proper consumption of the survey data files is available in the annual Survey Description documents by data year .

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