Table 3 Self-report sleep measures in US sample and stratified samples.
|  | US sample (N = 4826) | RS sample (N = 3663) |
|---|---|---|
Sleep health | ||
 Daytime symptoms | 9.9% (478) | 3.0% (111) |
 Poor sleep quality | 13.0% (629) | 9.4% (344) |
 Sleep midpoint | ||
  Early (< 02:00) | 15.9% (766) | 21.7% (794) |
  Late (> 04:00) | 8.0% (386) | 20.0% (734) |
 Sleep duration | ||
  Short (< 6 h) | 11.7% (565) | 14.3% (522) |
  Long (> 8 h) | 8.2% (397) | 8.8% (322) |
 Low sleep efficiency (< 85%) | 40.9% (1976) | 23.9% (877) |
Sleep disorders | ||
 Difficulty falling asleep | 27.3% (1317) | 20.6% (756) |
 Difficulty staying asleep | 52.1% (2516) | 13.5% (496) |
 Snoring | ||
  At least once/week | 23.9% (1151) | 43.9% (1607) |
  Never/rarely | 34.6% (1672) | 46.4% (1701) |
  Don’t know | 41.5% (2003) | 9.7% (355) |
 Stops breathing during sleep | ||
  Ever reported | 41.5% (2003) | 12.3% (450) |
  Never | 42.2% (2037) | 70.6% (2586) |
  Don’t know | 50.9% (2457) | 17.1% (627) |
Composite sleep scores | ||
 All sleep—unweighted | ||
  0 | 11.2% (542) | 18.2% (655) |
  1 | 23.2% (1120) | 30.8% (1130) |
  2 | 25.3% (1223) | 25.3% (927) |
  3 | 19.1% (920) | 13.0% (475) |
  4–6 | 20.0% (968) | 12.1% (441) |
  7–9 | 1.0% (53) | 0.7% (25) |
 All sleep—weighteda | ||
  0 | 5.8% (281) | 35.7% (1306) |
  1 | 28.9% (1393) | 27.0% (988) |
  2 | 23.8% (1147) | 12.7% (466) |
  3 | 12.8% (620) | 10.4% (381) |
  4–6 | 24.1% (1159) | 13.0% (477) |
  7–9 | 4.7% (226) | 1.3% (45) |
 Insomnia with short sleep | ||
  No (0) | 90.4% (4361) | 90.5% (3315) |
  Yes (1) | 9.6% (465) | 9.5% (348) |
 SATED score | ||
  0 | 34.7% (1674) | 49.4% (1810) |
  1 | 36.4% (1755) | 31.3% (1147) |
  2 | 18.7% (901) | 11.8% (433) |
  3 | 7.5% (362) | 5.7% (209) |
  4 | 2.4% (116) | 1.5% (56) |
  5 | 0.4% (18) | 0.2% (8) |
Selected score | ||
  0 | 67.0% (3233) | 78% (2857) |
  1 | 28.8% (1391) | 7.3% (745) |
  2 | 4.2% (202) | 1.7% (61) |
