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Table 1 Median values [± semi-interquratile ranges] for sleep parameters on three nights of alcohol withdrawal for three treatment groups (the last block shows the number of subjects providing data in each condition).

From: The impacts of nitrous oxide gas on sleep quality during alcohol withdrawal

Variable night Nitrous oxide Oxygen Air
n 1 32 30 30
  2 32 28 30
  3 31 25 30
Total sleeping time [h] 1 6.9 ± 0.7 6.8 ± 0.3 7.1 ± 0.5
  2 6.6 ± 0.5 6.8 ± 0.5 6.6 ± 0.7
  3 6.6 ± 0.5 6.8 ± 0.5 6.8 ± 0.5
Time awake [min] 1 46.0 ± 35.6 55.5 ± 13.4 47.5 ± 14.4
  2 66.0 ± 22.1 52.5 ± 31.3 53.0 ± 21.5
  3 55.0 ± 26.3 50.0 ± 25.5 48.0 ± 15.8
% of time awake 1 10.3 ± 7.7 12.3 ± 3.2 9.9 ± 3.2
  2 15.0 ± 4.8** 11.2 ± 6.5 11.7 ± 4.5
  3 11.6 ± 5.7 11.0 ± 5.3 10.4 ± 3.7
Sleep efficiency 1 86.3 ± 8.3 85.6 ± 3.8 88.3 ± 6.4
  2 82.6 ± 6.9 84.8 ± 6.8 82.6 ± 8.1
  3 82.9 ± 6.6 85.0 ± 6.5 84.9 ± 6.9
Movement time [min] 1 7.2 ± 4.4 9.0 ± 3.2 7.5 ± 2.6
  2 9.1 ± 3.8 8.2 ± 4.5 10.6 ± 4.9
  3 8.5 ± 4.3 8.9 ± 4.1 7.4 ± 2.5
Fragmentation index 1 44.5 ± 19.1 50.5 ± 13.8 46.0 ± 13.2
  2 51.7 ± 12.4 49.0 ± 13.7 50.8 ± 16.2
  3 49.5 ± 16.2 45.4 ± 9.1 37.1 ± 12.5
  1. ** Significantly different from night 1, p < 0.001.