title: Vitamin D treatment for the prevention of falls in older adults: systematic review and meta-analysis.
abstract: OBJECTIVE
  To systematically review and quantitatively synthesize the effect of vitamin D therapy on fall prevention in older adults.
  
  
  METHODS
  Systematic review and meta-analysis.
  
  
  METHODS
  MEDLINE, CINAHL, Web of Science, EMBASE, Cochrane Library, LILACS, bibliographies of selected articles, and previous systematic reviews through February 2009 were searched for eligible studies.
  
  
  METHODS
  Older adults (aged > or = 60) who participated in randomized controlled trials that both investigated the effectiveness of vitamin D therapy in the prevention of falls and used an explicit fall definition.
  
  
  METHODS
  Two authors independently extracted data, including study characteristics, quality assessment, and outcomes. The I(2) statistic was used to assess heterogeneity in a random-effects model.
  
  
  RESULTS
  Of 1,679 potentially relevant articles, 10 met inclusion criteria. In pooled analysis, vitamin D therapy (200-1,000 IU) resulted in 14% (relative risk (RR)=0.86, 95% confidence interval (CI)=0.79-0.93; I(2)=7%) fewer falls than calcium or placebo (number needed to treat =15). The following subgroups had significantly fewer falls: community-dwelling (aged <80), adjunctive calcium supplementation, no history of fractures or falls, duration longer than 6 months, cholecalciferol, and dose of 800 IU or greater. Meta-regression demonstrated no linear association between vitamin D dose or duration and treatment effect. Post hoc analysis including seven additional studies (17 total) without explicit fall definitions yielded smaller benefit (RR=0.92, 95% CI=0.87-0.98) and more heterogeneity (I(2)=36%) but found significant intergroup differences favoring adjunctive calcium over none (P=.001).
  
  
  CONCLUSIONS
  Vitamin D treatment effectively reduces the risk of falls in older adults. Future studies should investigate whether particular populations or treatment regimens may have greater benefit.
authors.affiliation: Division of Endocrinology and Metabolism, Department ofMedicine, Johns Hopkins University School of Medicine, 1830 East Monument Street, Suite 333, Baltimore, MD 21287, USA. rrastogi@jhmi.edu
authors.forename: Rita Rastogi
authors.initials: RR
authors.lastname: Kalyani
authors.forename: Brady
authors.initials: B
authors.lastname: Stein
authors.forename: Ritu
authors.initials: R
authors.lastname: Valiyil
authors.forename: Rebecca
authors.initials: R
authors.lastname: Manno
authors.forename: Janet W
authors.initials: JW
authors.lastname: Maynard
authors.forename: Deidra C
authors.initials: DC
authors.lastname: Crews
mesh_terms: D000058:Accidental Falls / Q000517:prevention & control*; D000368:Aged; D000369:Aged, 80 and over; D019587:Dietary Supplements; D005260:Female; D006801:Humans; D008297:Male; D014807:Vitamin D / Q000627:therapeutic use*; D014815:Vitamins / Q000627:therapeutic use*
chemical_list: D014815:Vitamins; D014807:Vitamin D