Table 2.

The correlation coefficients (r) and pair-wise t test between the measured and the true values of different indicators

Measures	Spearman correlation		Paired sample t test
	r	P value	P value
Heart rate	.667	<.001	.045
Step	.342	<.001	<.001
Distance	.728	<.001	<.001
Calorie	.492	<.001	.19
Sleep time	.683	<.001	.007