Table 2.

NHIS 2008 Balance Supplement accumulated prevalence of case-defining responses.

Total NHIS Balance Supplement Respondents (21,782)	Sample size, n	Prevalence % [95% CI]	Per 100,000 US Adults
Dizziness or Balance problems in last 12 months?	3,411	14.84% (14.2–15.5)	14,841
Feel off-balance or unsteady	2,094	9.07% (8.6 – 9.6)	9,074
Have difficulty walking in the dark	691	2.94% (2.7 –3.2)	2,943
Have difficulty walking on uneven surfaces	572	2.38% (2.2 – 2.7)	2,880
Blurred of fuzzy vision when moving your head	301	1.28% (1.1 – 1.5)	2,112
Drifting to the side when trying to walk straight	264	1.13% (1.0 – 1.3)	1,990
Problem defined as at least a ‘big problem’	79	0.32% (0.2 – 0.4)	1,364
Duration of symptoms of at least 1 year	70	0.27% (0.2 – 0.4)	1,319
Exclusions
Chronic neurologic conditions	16	0.05 (0.03 – 0.08)	947
Ophthalmic condition causing visual impairment	12	0.03% (0.02–0.05)	28

Sample numbers and prevalence (population-based %) values represent cumulative ‘yes’ responses, with each row representing a ‘yes’ response to that row and to each of the rows above it. Chronic neurologic conditions included “spinal cord injury”, “stroke”, “movement disorders such as Parkinson’s”, “muscular dystrophy” or “multiple sclerosis”. Ophthalmic conditions included a diagnosis “macular degeneration”, “glaucoma”, “diabetic retinopathy” or “cataracts”. Respondents with ophthalmic conditions must also have answered ‘yes’ to whether the condition causes visual impairment.