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Table 2 Gender, age and coffee consumption in three treatment groups.

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

  Nitrous oxide Oxygen Air Total
Gender
Male 25 21 23 69
Female 7 9 7 23
Age
27-36 6 3 8 17
37-46 14 13 12 39
47-56 10 12 10 32
56 + 2 2 0 4
Coffee consumption
0 cups/day 9 9 3 21
1-2 cups/day 20 19 21 60
3-5 cups/day 1 2 3 6