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Table 2 Subjective sleep parameters during a randomized, double-blind, placebo-controlled crossover study of shift work nurses: results at baseline and after 1 night melatonin or placebo treatment (N = 86)

From: Efficacy and hypnotic effects of melatonin in shift-work nurses: double-blind, placebo-controlled crossover trial

   Mean SD P(vs.baselinea) P(vs.placeboa) Fb Pb
Sleep onset latency Melatonin 21.5 17.7 < 0.05 < 0.05 6.3 0.01
  Placebo 49.7 30.3 < 0.05    
  Baseline 37.5 41.3     
Total sleep time Melatonin 392.1 52.4 > 0.05 > 0.05 0.49 NS
  Placebo 372 49.4 > 0.05    
  Baseline 450.5 82.3     
Number of awakenings Melatonin 5.1 1.9 > 0.05 > 0.05 0.64 NS
  Placebo 5.1 1.9 > 0.05    
  Baseline 5.2 2.1     
  1. a p values for Tukey post hoc analysis.
  2. b Overall test for differences