... missing, a missing category was included in all anal-yses to maintain as large a sample as possible, and the miss-ing category was compared with the reference category in the same way the other ... [8,10].Conclusion The prevalence of arthritis in Australia is rapidly approachingthat of cardiovascular disease [2]. As the cost to the Australianhealthcare system of managing arthritis and its symptoms ... statistical analyses, interpretation of the data, anddrafting of the manuscript. WJB participated in the study con-ception, study design, data acquisition, interpretation of the data, and drafting...