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Objective To examine the role of comorbidity and pain in the associations of hand osteoarthritis (OA) with self-reported and performance-based physical function in a general population of elderly persons. Methods We studied data from 2,942 participants ages 65-85 years in the European Project on OSteoArthritis, a collaborative observational study of 6 European cohorts (from Germany, Italy, The Netherlands, Spain, Sweden, and the UK). Outcome measures included self-reported physical function of the hands measured by the AUStralian/CANadian Osteoarthritis Hand Index (AUSCAN) for hand OA physical function subscale and performance-based grip strength measured using a strain gauge dynamometer. Results Comorbidity was not a confounder in the association of hand OA with self-reported and performance-based functional limitations, while the role of pain as a mediator was confirmed. Anxiety, depression, stroke, and osteoporosis were associated with AUSCAN scores reflecting more impairment. Depression and osteoporosis were associated with less grip strength. Conclusion Although comorbidity was decidedly and independently associated with hand functional limitation, it had no effect on the relationship of hand OA with physical function. Hand OA was found to be associated with both self-reported and performance-based physical function impairment; the association was found to be partially mediated by pain, which reduced its impact. [ABSTRACT FROM AUTHOR]

Summary Background Recent evidence indicates that a lower plasma level of 25-hydroxyvitamin D (25 OHD) is associated with a higher risk of the metabolic syndrome. It has not been studied in older people with a high prevalence of vitamin D insufficiency. Objective This study investigates the association between vitamin D status and the metabolic syndrome in community-dwelling older persons in the Netherlands. Design and patients The study is part of the Longitudinal Aging Study Amsterdam, an ongoing cohort study in a representative sample of Dutch older persons. A total of 1286 subjects (629 men and 657 women) between the ages of 65 and 88 years participated in the study. Measurements Metabolic syndrome (U.S. National Cholesterol Education Program definition) and its individual components were assessed as well as serum 25 OHD levels. Results Among the participants, the prevalence of the metabolic syndrome was 37·0%. The mean 25 OHD level was 53·3 n m; 47·8% had 25 OHD levels below 50 n m. There was a significantly increased risk of the metabolic syndrome in the subjects with serum 25 OHD levels below 50 n m, compared with that of subjects with levels over 50 n m [odds ratio (OR) = 1·54; 95% confidence interval (CI) 1·23-1·94]. After adjustment for confounders, age, sex, season, years of education, alcohol use, total activity, smoking and PTH, the OR was 1·29 (95% CI 1·00-1·68). The association between vitamin D deficiency and the metabolic syndrome was mainly determined by the components low HDL and (high) waist circumference. Conclusions Vitamin D deficiency is common in the older population in the Netherlands, and subjects with serum 25 OHD below 50 n m have a higher risk of the metabolic syndrome. [ABSTRACT FROM AUTHOR]