Findings from this survey will be used to determine the prevalence of major diseases and risk factors for diseases. Information will be used to assess nutritional status and its association with health promotion and disease prevention.
NHANES findings are also the basis for national standards for such measurements as height, weight, and blood pressure. Data from this survey will be used in epidemiological studies and health sciences research, which help develop sound public health policy, direct and design health programs and services, and expand the health knowledge for the Nation. As in past health examination surveys, data will be collected on the prevalence of chronic conditions in the population. Estimates for previously undiagnosed conditions, as well as those known to and reported by respondents, are produced through the survey.
Smoking, alcohol consumption, sexual practices, drug use, physical fitness and activity, weight, and dietary intake will be studied. Data on certain aspects of reproductive health, such as use of oral contraceptives and breastfeeding practices, will also be collected.
The sample for the survey is selected to represent the U. Since the United States has experienced dramatic growth in the number of older people during this century, the aging population has major implications for health care needs, public policy, and research priorities. NCHS is working with public health agencies to increase the knowledge of the health status of older Americans. All participants visit the physician.
Dietary interviews and body measurements are included for everyone. All but the very young have a blood sample taken and will have a dental screening. Depending upon the age of the participant, the rest of the examination includes tests and procedures to assess the various aspects of health listed above. In general, the older the individual, the more extensive the examination.
Health measurements are performed in specially-designed and equipped mobile centers, which travel to locations throughout the country. The study team consists of a physician, medical and health technicians, as well as dietary and health interviewers.
An advanced computer system using high-end servers, desktop PCs, and wide-area networking collect and process all of the NHANES data, nearly eliminating the need for paper forms and manual coding operations. This system allows interviewers to use notebook computers with electronic pens. The assessments were administered by trained interviewers at the end of the face-to-face private interview in the Mobile Examination Center MEC Interview.
Before the assessments began, interviewers asked participants for consent to audio-record for the purpose of scoring and quality control. Because the interviewers were bilingual only in English and Spanish, interpreters provided instructions for assessments administered in Korean, Vietnamese, and Chinese. Transcription and scoring usually were done on the same day assessments were conducted. Tests conducted in Korean, Vietnamese and Chinese were transcribed verbatim and scored by consultants in those languages at a later date.
The majority of DSST were also independently scored by two interviewers. Inconsistent scores were adjudicated by a third party, as necessary. In addition, review of the audio-recordings of assessments were evaluated for consistency of interviewer instructions and to determine test score accuracy. Edits were made to ensure the completeness, consistency, and analytic usefulness of the data. When available, extensive review of the recorded interviews were conducted to clarify inconsistent responses, to evaluate the quality of the data, and to finalize the data set.
Non-response to this component varied by age, education, race-ethnicity, and other factors. Because non-response to cognitive assessments may be related to cognitive functioning itself, analysts are encouraged to conduct a thorough non-response bias analysis of these data as part of their preliminary research plan.
Sample sizes availability differ for each assessment. As the codes demonstrate, MEC participants did not always attempt or complete all of the tests. CFASTAT coded as 4, 5, 6 indicate persons who did not do any of the assessments due to ineligibility or other reasons. These persons are coded as missing throughout the remainder of the data set. Language was determined by the participant at the time of the testing. CFDAPP: This variable provides a summary result for the practice pretest that took place before the animal fluency was administered.
Eligible Sample Participants aged 60 years and older were eligible. Data Processing and Editing Edits were made to ensure the completeness, consistency, and analytic usefulness of the data.
Analytic Notes Non-response to this component varied by age, education, race-ethnicity, and other factors. References 1. Minus Related Pages. Related Sites.
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