Assessment of Perioperative Sleep Characteristics Using Subjective and Objective Methods: A Secondary Analysis of Prospective Cohort Study

Figure 3

Bland-Altman plots of sleep fragmentation, sleep latency, and total night sleep before and after surgery. SMHSQ: St. Mary’s Hospital Sleep Questionnaire. In each plot, the solid black line represents the mean difference (bias), and the red dashed lines represent the 95% limits of agreement of the mean difference.