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Bias and agreement limits based on Bland-Altman plots for the actigraphy and the Samsung watch.
| Parameter | Mean difference (SD) | Lower and upper agreement limits |
| Total sleep time (min) | −22.51 (73.24) | −166.07, 121.04 |
| Sleep efficiency (%) | −4.44 (7.88) | −19.89, 11.01 |
| Wake after sleep onset (min) | 31.27 (35.15) | −37.62, 100.15 |
