NCHS collects data with surveys, from other agencies and U.S. states, from administrative sources, and from partnerships with private health partners. NCHS collects data from birth and death records, medical records, interview surveys, and through direct physical examinations and laboratory testing. These diverse sources give perspectives to help understand the U.S. population's health, health outcomes, and influences on health. There are four major data collection programs at NCHS:
National Vital Statistics System The
National Vital Statistics System (NVSS) collects official
vital statistics data based on the collection and registration of birth and death events at the state and local levels. NCHS works in partnership with the vital registration systems in each
jurisdiction to produce critical information on such topics as teenage births and birth rates, prenatal care and birth weight,
risk factors for adverse pregnancy outcomes, infant mortality rates, leading
causes of death, and
life expectancy.
National Health Interview Survey The
National Health Interview Survey (NHIS) provides information on the health status of the U.S. civilian noninstitutionalized population through confidential
interviews conducted in households by
Census Bureau interviewers. NHIS is the Nation's largest in-person household health survey, providing data on health status, access to and use of health services,
health insurance coverage,
immunizations,
risk factors, and health-related
behaviors.
National Health and Nutrition Examination Survey The
National Health and Nutrition Examination Survey (NHANES) is NCHS's most in-depth and
logistically complex survey, operating out of mobile examination centers that travel to randomly selected sites throughout the U.S. to assess the health and nutritional status of Americans. This survey combines personal interviews with standardized
physical examinations,
diagnostic procedures, and
laboratory tests to obtain information about diagnosed and undiagnosed conditions; growth and development, including
overweight and
obesity;
diet and
nutrition;
risk factors; and environmental exposures.
National Health Care Surveys The National Health Care Surveys provide information about the organizations and providers that supply
health care, the services they render, and the patients they serve. Provider sites surveyed include physician offices,
community health centers,
ambulatory surgery centers, hospital
outpatient and
emergency departments,
inpatient hospital units,
residential care facilities,
nursing homes,
home health care agencies, and
hospice organizations. The National Health Care Surveys are used to study resource use, including
staffing; quality of care, including patient safety; clinical management of specific conditions;
disparities in the use and quality of care; and diffusion of health care technologies, including
drugs,
surgical procedures, and information technologies. ==Other data collection programs==