In Reply Narozny et al raise an interesting observation about our article, which highlights the need for research in sensory impairments. Balance disorder is a major public health concern in the US and significantly contributes to the onset of falls and hip fractures. Balance testing was incorporated in the National Health and Nutrition Examination Survey (NHANES) from 1999 to 2004 to estimate the prevalence of balance problems in the US general population using the modified Romberg Test of Standing Balance on Firm and Compliant Support Surfaces (the modified Romberg test). Based on this national surveillance, Agrawal and colleagues reported an estimated 35.4% of US adults aged 40 years or older (69 million Americans) experienced vestibular dysfunction as determined by the modified Romberg test.
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