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Table 1 Study participant characteristics by sleep duration, NHANES 2005–2006

From: Relationship between sleep characteristics and measures of body size and composition in a nationally-representative sample

  Sleep duration
  ≤56 h 6 h 7 h 8 h ≥9 h
Age, year, mean (SD) 42.1 (15.9) 42.9 (15.0) 42.4 (15.1) 43.2 (16.9) 41.7 (20.7)
Female, % 39.4 47.3 49.7 49.3 57.3
Non-Hispanic White, % 58.6 67.0 73.6 71.9 68.8
Non-Hispanic Black, % 23.5 14.9 8.4 8.9 12.3
Less than high school grad, % 20.2 13.4 14.5 15.0 26.2
Current smoker, % 34.8 25.4 17.8 18.6 27.1
Former smoker, % 16.7 20.0 23.4 24.1 16.9
Alcohol consumption, > 1 drink/day, % 15.1 14.1 12.5 14.8 11.3
Fat intake, mean (SD), gram/kcal 37.2 (8.4) 37.7 (8.8) 37.3 (8.5) 37.1 (8.2) 37.1 (7.9)
Carbohydrate intake, mean (SD), gram/kcal 124 (23) 121 (25) 121 (23) 121 (23) 124 (24)
Total caloric intake, kcal 2256 (934) 2186 (864) 2224 (852) 2176 (866) 2084 (870)
History of diabetes, % 8.1 5.2 4.3 6.3 7.1
Sit during the day and not walk about much, % 21.0 18.7 21.1 20.7 26.9
  1. Percentages, means and standard deviations are weighted