Frailty is Highly Prevalent and Associated with Vitamin D Deficiency in Male Nursing Home Residents

To the Editor: Frailty is recognized as an age‐related decrease in resistance and an increase in vulnerability to adverse outcomes.1-3 An increase in recently conducted research on frailty has added evidence to the literature, but most studies have focused on noninstitutionalized populations, and there is limited information in nursing home (NH) populations. Most NH residents are frail.4 Another common condition in NH populations is vitamin D deficiency.5 A number of studies have shown associations between vitamin D deficiency and a wide range of skeletal and nonskeletal medical conditions,6 all of which may contribute to the development of frailty. This study aimed to investigate the association between frailty and vitamin D status in NH residents, which to the authors' knowledge, has not been examined