Table 6.

Estimation of Night-Level Metrics, Using Data From Classifiers Built on Various Data Sources

Metric	Device	Mean error	MAE	RMSE	R 2
Sleep efficiency (%)	Apple Watch	2.55	4.24	4.72	0.33
	Oura Ring	3.58	4.55	5.44	0.43
	ECG + Link	1.84	4.64	5.48	0.27
Sleep onset latency (min)	Apple Watch	−2.15	5.89	8.70	0.00
	Oura Ring	−1.38	3.79	5.02	0.04
	ECG + Link	−0.87	6.52	9.08	0.00
WASO (min)	Apple Watch	−11.58	18.27	20.49	0.51
	Oura Ring	−16.90	21.51	25.42	0.48
	ECG + Link	−8.95	19.11	23.79	0.42
Total sleep time (min)	Apple Watch	13.73	22.69	25.29	0.35
	Oura Ring	18.28	23.28	27.64	0.76
	ECG + Link	9.82	24.92	29.48	0.31

Here, the values reported are for the models computed with night-level normalization, but without class oversampling.