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Average of actigraphy and PSG are on the x-axis, difference between actigraphy and PSG on y-axis. Dashed line shows mean difference, solid lines range of agreement (± 2 SD). (A) TST = total sleep time (minutes). (B) SOL = sleep onset latency (minutes). (C) SE = sleep efficiency (%). (D) WASO = wake after sleep onset (minutes). (E) Awakenings (number). PSG = polysomnography, SD = standard deviation.
