Figure 2 | Scientific Reports

Figure 2

From: Validation of sleep-staging accuracy for an in-home sleep electroencephalography device compared with simultaneous polysomnography in patients with obstructive sleep apnea

Figure 2

Bland–Altman plots comparing type I PSG and portable EEG device values. The Bland–Altman plots depict the mean bias (red solid line) and upper and lower limits of agreement (1.96 standard deviations from bias; black dashed lines) for each sleep parameter for the portable EEG device compared with type I PSG. The parentheses contain information about the t-test, and if the P-value is significant, it indicates that the bias, depicted to the right of the solid red line, is statistically significant. A positive solid line signifies an overestimation of the portable EEG device, while a negative line signifies an underestimation.

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