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Table 1 Demographic and subjective sleep data of subjects (N = 86)

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

  Mean (SD) or percentage (n)
Sex 80.2% female (69)
Age 30.05 (5.2)
Mean BMI in kg/m2 26.7 (3.1)
Subjective sleep onset latency in min 37.5 (41.3)
Subjective number of awakenings 5.2 (2.1)
Subjective duration of sleep in min 450.5 (82.3)