The BRFSS is an ongoing, state-based, random-digit-dialed telephone survey that collects self-reported health information from a representative sample of the civilian, noninstitutionalized U.S. population aged ≥18 years.5 In 1996, a total of 15,656 persons in Arizona (n=1957), Kansas (n=2008), Missouri (n=1550), Montana (n=1803), New Jersey (n=2894), Pennsylvania (n=3595), and Rhode Island (n=1849) responded to the arthritis module. Persons who had chronic joint symptoms were defined as those answering "yes" to two questions: "During the past 12 months, have you had pain, aching, stiffness or swelling in or around a joint?" and "Were these symptoms present on most days for at least one month?" Persons who had activity limitation attributable to chronic joint symptoms were defined as those also answering "yes" to "Are you now limited in any way in any activities because of joint symptoms?" Persons were considered to have had arthritis diagnosed by a doctor if they answered "yes" to "Have you ever been told by a doctor that you have arthritis?" Persons who had arthritis diagnosed by a doctor were considered to know their type of arthritis if they specified a type in response to the question "What type of arthritis did the doctor say you have?" and were considered to have current doctor-based treatment for arthritis if they answered "yes" to "Are you currently being treated by a doctor for arthritis?" Weighted prevalence was used to estimate the number of persons with chronic joint symptoms in each state. Data were analyzed using SUDAAN®,6 and the results were weighted to account for the complex sample survey design.