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Table 2 Demographic, medical factors and visual impairment across sleep duration categories: National Health Interview Survey 2009

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

N = 29815   < 6 h 6-8 h > 8 h
    n = 8,454 n = 8,734 N = 2,593
  Demographic  
Female, n (%)   4787 (57) 4737 (54) 1539 (59)
Income, < 35,000, n (%)*   6377 (75) 6228 (71) 2261 (87)
  Medical factors  
Underweight, n (%)*   2821(33) 3381 (39) 983 (38)
Normal weight, n (%)*   2832 (33) 3132 (36) 869 (34)
Obesity, n (%)   2801 (33) 2221 (25) 741 (27)
Diabetes, n (%)*   768 (9) 540 (6) 332 (13)
Hypertension, n (%)   2641 (31) 2090 (24) 938 (36)
Heart Disease, n (%)*   757 (9) 617 (7) 325 (13)
  1. *p < 0.001.