Table 1.

Spearman correlation coefficients of the four acceleration summary measures with the five activity categories (sleep; sedentary, light, moderate, and vigorous PA) when processing three-dimensional acceleration data at different sample rates.

	(Hz)	ENMONZ	MAD	AI	ROCAM
Data sampled at (Hz)	100	0.760	0.837	0.845	0.861
	50	0.761	0.844	0.848	0.872
	25	0.758	0.845	0.848	0.883
	10	0.737	0.843	0.844	0.884

PA stands for Physical Activity, ENMONZ for Euclidean Norm Minus One Non-Zero, MAD for mean amplitude deviation, AI for Activity Index, and ROCAM for Rate Of Change Acceleration Movement (the latter being a new algorithm proposed in this study). For the algorithmic definitions of these four accelerometer summary measures, see Equations (1)–(4) in the text. For the MATLAB implementation computing those, see https://github.com/ThanasisTsanas/ActigraphyToolbox (last accessed on 30 June 2022).