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Table 1 Demographic, medical factors, sleep duration and visual impairment in the National Health Interview Survey

From: Association between visual impairment and sleep duration: analysis of the 2009 National Health Interview Survey (NHIS)

(%) Total N = 29815 Black n = 4407 White N = 25408 P
Age, years 48 ± 18 46 ± 17 48 ± 18 <0.001
Female sex 56% 61% 55% <0.001
Income, <35,000 77% 84% 76% <0.001
BMI (mean ± SD) 27 ± 6 29 ± 7 27 ± 6 <0.001
Diabetes 8% 12% 8% <0.001
Hypertension 28% 36% 27% <0.001
Heart disease 8% 6% 9% <0.001
Depressive symptoms 26% 29% 26% <0.001
Visual impairment 10% 11% 10% <0.01
Short sleep 49% 59% 48% <0.001
Long sleep 23% 31% 22% <0.001
  1. The P-value indicate differences between Black and White race-ethnic groups.