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MEDLINE and the Cochrane Controlled Trials Register (1960 to February 2004), EMBASE/Excerpta Medica (1991 to February 2004), and the American Society for Bone and Mineral Research conference abstracts (1995–2002); bibliographies of relevant studies; and experts in the field.
Study selection and assessment:
randomised controlled trials (RCTs) that compared prophylactic use of any type of vitamin D with a control condition in community dwelling or institutionalised older people (mean age of study participants had to be ⩾60 y) and included a methods section that stated how falls (the outcome) were defined and ascertained. Individual study quality was assessed using specified criteria that …
For correspondence: Dr H A Bischoff-Ferrari, Division of Aging, Brigham and Women’s Hospital, Boston, MA, USA.
Sources of funding: Harvard/Harford Foundation; Charles A King Trust Fellowship Award; Irene and Fredrick Stare Nutrition Education Fund; Swiss Foundation for Nutrition Research; International Foundation for the Promotion of Nutrition Research and Nutrition Education.