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. 2014 Aug 12;2014(8):CD009776. doi: 10.1002/14651858.CD009776.pub2

Comparison 5. Hypnotics versus placebo.

Outcome or subgroup title No. of studies No. of participants Statistical method Effect size
1 Total sleep time (after first and second the night shift) 1 28 Mean Difference (IV, Fixed, 95% CI) 44.0 [‐22.67, 110.67]