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The purpose of this study was to use the meta-analytic approach to resolve these discrepancies.<\/jats:p>\n                     <\/jats:sec><jats:sec>\n                        <jats:title>Methods<\/jats:title>\n                        <jats:p>The inclusion criteria were: (1) randomized controlled trials, (2) exercise (aerobic, strength training, or both) \u22654 weeks, (3) comparative control group, (4) adults with osteoarthritis, rheumatoid arthritis, fibromyalgia or systemic lupus erythematosus, (5) published studies in any language since January 1, 1981 and (6) depressive symptoms assessed. Studies were located by searching 10 electronic databases, cross-referencing, hand searching and expert review. Dual-selection of studies and data abstraction was performed. Hedge\u2019s standardized mean difference effect size (g) was calculated for each result and pooled using random-effects models, an approach that accounts for heterogeneity. Non-overlapping 95% confidence intervals (CI) were considered statistically significant. Heterogeneity based on fixed-effect models was estimated using Q and <jats:italic>I<\/jats:italic><jats:sup>\n                              <jats:italic>2<\/jats:italic>\n                           <\/jats:sup> with alpha values \u22640.10 for Q considered statistically significant.<\/jats:p>\n                     <\/jats:sec><jats:sec>\n                        <jats:title>Results<\/jats:title>\n                        <jats:p>Of the 500 citations reviewed, 2,449 participants (1,470 exercise, 979 control) nested within 29 studies were included. Length of training, reported as mean\u2009\u00b1\u2009standard deviation (\u00b1SD) was 19\u2009\u00b1\u200916 weeks, frequency 4\u2009\u00b1\u20092 times per week and duration 34\u2009\u00b1\u200917 minutes per session. Overall, statistically significant exercise minus control group reductions were found for depressive symptoms (g\u2009=\u2009\u22120.42, 95% CI, \u22120.58, \u22120.26, Q\u2009=\u2009126.9, <jats:italic>P<\/jats:italic> &lt;0.0001, <jats:italic>I<\/jats:italic><jats:sup>\n                              <jats:italic>2<\/jats:italic>\n                           <\/jats:sup>\u2009=\u200973.2%). The number needed-to-treat was 7 (95% CI, 6 to 11) with an estimated 3.1 million (95% CI, 2.0 to 3.7) United States adults not currently meeting physical activity guidelines improving their depressive symptoms if they began and maintained a regular exercise program. Using Cohen\u2019s U<jats:sub>3<\/jats:sub> Index, the percentile reduction was 16.4% (95% CI, 10.4% to 21.9%). All studies were considered to be at high risk of bias with respect to blinding of participants and personnel to group assignment.<\/jats:p>\n                     <\/jats:sec><jats:sec>\n                        <jats:title>Conclusions<\/jats:title>\n                        <jats:p>Exercise is associated with reductions in depressive symptoms among selected adults with AORC. A need exists for additional, well-designed and reported studies on this topic.<\/jats:p>\n                     <\/jats:sec>","DOI":"10.1186\/s13075-015-0533-5","type":"journal-article","created":{"date-parts":[[2015,1,31]],"date-time":"2015-01-31T13:30:24Z","timestamp":1422711024000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":72,"title":["Effects of exercise on depression in adults with arthritis: a systematic review with meta-analysis of randomized controlled trials"],"prefix":"10.1186","volume":"17","author":[{"given":"George A","family":"Kelley","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kristi S","family":"Kelley","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jennifer M","family":"Hootman","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2015,2,3]]},"reference":[{"key":"533_CR1","first-page":"869","volume":"62","author":"KE Barbour","year":"2013","unstructured":"Barbour KE, Helmick CG, Theis KA, Murphy LB, Hootman JM, Brady TJ, et al. 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