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. 2024 Jan 19;24(2):635. doi: 10.3390/s24020635

Table 8.

Bias and limits of agreement between device- and PSG-measured light sleep.

Device
(min)
PSG
(min)
Bias LOA ICC
Inspire 256.8 (73.0) 243.0 (42.2) 13.7 (63.6) 0.79 0.42 (0.16–0.63)
Versa 246.2 (72.2) 244.9 (43.1) 1.3 (65.3) 0.80 0.40 (0.11–0.64)
Vivosmart 263.3 (51.7) 243.0 (41.3) 155 + −0.56 × ref 0.41 0.32 (0.05–0.55)
Oura Ring 193.5 (64.3) 243.0 (42.2) −49.5 (59.0) 0.60 0.29 (−0.03–0.55)
Withings 235.9 (58.5) 243.6 (42.7) 170 + −0.73 × ref 0.51 0.19 (−0.11–0.47)

Bias = absolute bias and standard deviation. LOA = limits of agreement (Bias ± ref × value), ICC = intraclass correlation coefficient and 95% confidence intervals.