Abstract
To evaluate if similar constellations of factors underlie the risks of falls and injuries on falling for Japanese women as reported for predominately white populations. A prospective cohort study The island of Oahu The older Japanese women who participated in the Hawaii Osteoporosis Study (mean age = 74 +/- 5 (SD) years). As outcomes: falls and serious injuries on falling. As predictors: anthropometric measurements, measurements of neuromuscular performance, activities of daily living (ADLs), past falls, and other suspected risk factors for falls and serious injuries. In multivariable models, four subject characteristics were positively associated with having a fall (having a fall in the past year (RR = 2.0 (95% CI, 1.5-2.8)), slow chair stands (RR = 1.4 (95% CI, 1.0-1.9), a short height (RR = 1.5 (95% CI, 1.1-2.1)), difficulties with five or more ADLs (RR = 1.5 (95% CI, 1.1-2.1))). Two subject characteristics were negatively associated with having a fall (ability to perform a full tandem balance with eyes closed (RR = .7 (95% CI, .5-1.0)) and having a long functional reach (RR = .7 (95% CI, .5-1.0))). The RRs represent as nearly as possible comparisons of the upper (or lower) quartile and the remaining quartiles. In multivariable models, long times for chair stands (odds ratio (OR) = 3.0 (95% CI, 1.5-6.1)) and a low BMI (OR = 3.1 (95% CI, 1.5-6.4)) were positively associated with having a serious injury among women who had a fall. Among the same women, taking part in an activity they did frequently (OR = .3 (95% CI, .1-.8)) and slow foot reaction times (OR = .3 (95% CI, .1-.8)) were associated negatively with having a serious injury. The results from this Japanese cohort support the conclusion that women at high risk of falling and serious fall injuries can be identified using a questionnaire and simple, performance-based tests of neuromuscular function. The risk factors for falling overlapped, but were distinct from, those for suffering a serious injury once a fall had occurred.
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