The National Health Interview Survey (NHIS) is an annual, cross-sectional survey intended to provide nationally representative estimates on a wide range of health status and utilization measures among the nonmilitary, noninstitutionalized population of the United States. Each annual data set can be used to examine the disease burden and access to care that individuals and families are currently experiencing in the United States. NHIS is designed by the CDC's National Center for Health Statistics (NCHS) – the government agency tasked to monitor the population's health status and behavior – and administered by the U.S. Census Bureau. NHIS has been administered since 1957, although the core content and questionnaires undergo major revisions every 10–15 years. NHIS allows both governmental and outside researchers to obtain estimates on a variety of health-related topics among either the entire nation or specific demographic groups of the population. Also, since the survey design is cross-sectional rather than longitudinal, health information can be trended for demographic groups and the country as a whole, but not for individuals or families. History Authorized by the National Health Survey Act of 1956, the U.S. Public Health Service was tasked with implementing an annual survey to collect information on morbidities – physical or mental conditions related to any illness or injury – and medical service and medical facility utilization. The most recent re-design of the survey questionnaire was implemented in 1997. Research topics NHIS data contain information on health, influences on health, and health outcomes, as well as common demographic indicators to give users the ability to examine health status, behavior, and risk factors within and across subsets of the population (such as racial and ethnic health disparities). The major health topics covered in the Core questionnaires include health status, insurance coverage, complementary and alternative medicine, use of health services, immunizations, health behaviors, injuries, occupational health, cancer screening, ability to perform daily activities, and conditions such as asthma, diabetes, mental health. NCHS continually produces chart books, statistical briefs, and fact sheets using NHIS data which shed light on these various facets of morbidities and how the American populace behaves in response. Periodically, the NHIS includes supplemental questionnaires regarding a focused topic that might be of particular current interest. For example, a cancer supplement was fielded in 1987, 1992, 2000, 2003, 2005, 2008, and 2010, and sponsored by the National Cancer Institute and the National Center for Chronic Disease Prevention. This supplement