RT Journal Article SR Electronic T1 The Influence of Weather Conditions on Joint Pain in Older People with Osteoarthritis: Results from the European Project on OSteoArthritis JF The Journal of Rheumatology JO J Rheumatol FD The Journal of Rheumatology SP jrheum.141594 DO 10.3899/jrheum.141594 A1 Erik J. Timmermans A1 Laura A. Schaap A1 Florian Herbolsheimer A1 Elaine M. Dennison A1 Stefania Maggi A1 Nancy L. Pedersen A1 Maria Victoria Castell A1 Michael D. Denkinger A1 Mark H. Edwards A1 Federica Limongi A1 Mercedes Sánchez-Martínez A1 Paola Siviero A1 Rocio Queipo A1 Richard Peter A1 Suzan van der Pas A1 Dorly J.H. Deeg YR 2015 UL http://www.jrheum.org/content/early/2015/08/26/jrheum.141594.abstract AB Objective This study examined whether daily weather conditions, 3-day average weather conditions, and changes in weather conditions influence joint pain in older people with osteoarthritis (OA) in 6 European countries. Methods Data from the population-based European Project on OSteoArthritis were used. The American College of Rheumatology classification criteria were used to diagnose OA in older people (65–85 yrs). After the baseline interview, at 6 months, and after the 12–18 months followup interview, joint pain was assessed using 2-week pain calendars. Daily values for temperature, precipitation, atmospheric pressure, relative humidity, and wind speed were obtained from local weather stations. Multilevel regression modelling was used to examine the pain-weather associations, adjusted for several confounders. Results The study included 810 participants with OA in the knee, hand, and/or hip. After adjustment, there were significant associations of joint pain with daily average humidity (B = 0.004, p < 0.01) and 3-day average humidity (B = 0.004, p = 0.01). A significant interaction effect was found between daily average humidity and temperature on joint pain. The effect of humidity on pain was stronger in relatively cold weather conditions. Changes in weather variables between 2 consecutive days were not significantly associated with reported joint pain. Conclusion The associations between pain and daily average weather conditions suggest that a causal relationship exist between joint pain and weather variables, but the associations between day-to-day weather changes and pain do not confirm causation. Knowledge about the relationship between joint pain in OA and weather may help individuals with OA, physicians, and therapists to better understand and manage fluctuations in pain.