Table 4.

Heterogeneity between years of the studies on the patient wristband and ME.

Groups		Effect size and 95% Interval			Test of null (Two-Tail)		Heterogeneity
Group	Number of Studies	Point estimate	Lower limit	Upper limit	Z-value	P-value	Q-value	df (Q)	P-value	I-squared
Fixed effect analysis
<2008	5	0.292	0.285	0.298	-103.687	0.000	1 122.177	4	0.000	99.644
>2008	9	0.222	0.220	0.224	-348.701	0.000	17 768.603	8	0.000	99.955
Total within							18 890.780	12	0.000
Total between							460.300	1	0.000
Overall	14	0.229	0.228	0.231	-363.157	0.000	19 351.080	13	0.000	99.933