Table 1

Sociodemographic characteristics and objectively measured physical activity levels of the US population aged 12 years and older from the NHANES (2003–2006) by visual impairment

Normal visionUncorrected refractive errorVisual impairmentP value
NWeighted %NWeighted %NWeighted %
 Weighted N70 084 20238 937 9836 184 612
Age group, years0.001
 Non-Hispanic white155574.595071.322977.0
 Non-Hispanic black8029.654310.7869.5
Household income<0.001
 <20 00096417.580624.720938.6
 20 000–74 999174052.2116253.521856.8
 ≥75 00097636.551131.65618.0
Weight status*0.649
Employment status†
Smoking status†0.079
 Never smoker124346.078045.016744.6
 Former smoker61122.745024.213033.3
 Current smoker49620.030618.45115.3
Chronic condition‡<0.001
  • *BMI was calculated as weight in kilograms divided by height in metres squared. Weight status was defined using BMI-to-age percentile in those aged 12–19 years, and WHO standard cut-off for adults 20 years and older.

  • †Data are only available on adults aged 20 years and older.

  • ‡If participants have one of the following conditions: cardiovascular disease, diabetes, arthritis and cancer.

  • BMI, body mass index; NHANES, National Health Nutrition and Examinations Survey.