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Figure 4: Distribution of actual sampling times during waking hours following sleep at home or sleep in the lab. Each box represents the 25-75 percentiles, the horizontal line within the box represents the median and the whiskers show the complete range of sampling times. Base, Baseline samples taken following sleep at home; L-1, samples taken following the 1st night of sleep in the lab; L-2, samples taken following the 2nd night of sleep in the lab; P-Lab, samples taken during the day after subjects resumed sleeping at home. Non-parametric analyses of the actual sampling times for each Location using Friedman’s rank test revealed a signifi cant difference between Locations for samples provided immediately upon awakening (÷2 F3 = 13.18, P = 0.0043); + 90 min (÷2 F3 = 15.62, P = 0.0014); 12 pm (÷2 F3 = 8.82, P = 0.032); and 5 pm (÷2 F3 = 13.26, P = 0.0041).

Figure 4: Distribution of actual sampling times during waking hours following sleep at home or sleep in the lab. Each box represents the 25-75 percentiles, the horizontal line within the box represents the median and the whiskers show the complete range of sampling times. Base, Baseline samples taken following sleep at home; L-1, samples taken following the 1st night of sleep in the lab; L-2, samples taken following the 2nd night of sleep in the lab; P-Lab, samples taken during the day after subjects resumed sleeping at home. Non-parametric analyses of the actual sampling times for each Location using Friedman’s rank test revealed a signifi cant difference between Locations for samples provided immediately upon awakening (÷2 F3 = 13.18, P = 0.0043); + 90 min (÷2 F3 = 15.62, P = 0.0014); 12 pm (÷2 F3 = 8.82, P = 0.032); and 5 pm (÷2 F3 = 13.26, P = 0.0041).