Table 3. Comparison of circadian rest-activity rhythm using a Cosinor periodogram between Actiwatch 2 and Fitbit Charge HR (N=15).

^**p<0.01, ^†correlation coefficient (r=0.00–0.30: negligible correlation, r=0.30–0.50: low correlation, r=0.50–0.70: moderate correlation, r=0.70–0.90: high correlation, r=0.90–1.00: very high correlation). N: number of participants