TABLE 1. Case definitions and prevalences* of selected chronic conditions among adults aged ≥50 years — National Health and Nutrition Examination Survey, United States, 1999–2004 and 2011–2016.

Health condition	Case definition	Prevalence, % (SE)
		1999–2004	2011–2016
General health (fair or poor)	Reporting fair or poor general health versus excellent, very good, or good	24.5 (1.1)	21.7 (1.0)
Any arthritis	Answered “yes” to ever being told had arthritis	43.3 (0.8)	45.0 (0.9)
Rheumatoid arthritis	Answered “yes” to ever being told had arthritis and “yes” to having rheumatoid arthritis	16.3 (0.6)	6.1 (0.4)
Asthma	Answered “yes” to both ever being told had asthma and “yes” to still having asthma	5.4 (0.4)	8.9 (0.6)
Diabetes	Answered “yes” to ever being told had diabetes by doctor or other health care professional	13.7 (0.6)	17.7 (0.6)
Uncontrolled diabetes	Glycohemoglobin level ≥6.5%	11.6 (0.5)	14.6 (0.6)
Emphysema	Answered “yes” to ever being told had emphysema by a doctor or other health care professional	4.1 (0.4)	3.7 (0.3)
Heart disease	Answered “yes” to ever being told had congestive heart failure, coronary heart disease, angina/angina pectoris, or heart attack by a doctor or other health care professional	16.7 (0.8)	13.4 (0.5)
Liver condition	Answered “yes” to both ever being told had any kind of liver condition by a doctor or other health care professional and “yes” to still having a liver condition	1.6 (0.2)	2.6 (0.3)
Obesity	Body mass index score (determined during clinical examination) ≥30 kg/m2	32.7 (1.0)	39.9 (1.0)
Stroke	Answered “yes” to ever being told had a stroke	5.4 (0.3)	5.4 (0.3)

Abbreviation: SE = standard error.

* All estimates were standardized by using 5-year age increments and sex to U.S. 2000 Census population.