Reliability and validity of ten consumer activity trackers

Table 4 Mean difference scores with the gold standards and limits of agreement of the activity trackers in the laboratory and free-living study

	Mean difference (Optogait – tracker, lab study)^a	Limits of Agreement		Mean difference (ActivPAL- tracker, free-living study)^a	Limits of Agreement
		Lower	Upper		Lower	Upper
ActivPAL	9	−3	21
Lumoback	8	−31	47	17	−778	812
Fitbit Flex	188	−240	615	−150	−1424	1124
Jawbone UP	34	−54	81	−58	−1732	1618
Nike+ Fuelband	598	−613	1809	977	−1288	3240
Misfit Shine	−6	−91	85	−43	−743	657
Withings Pulse	15	−31	61	323	−864	1510
Fitbit Zip	11	−12	34	−49	−482	384
Omron	−82	−390	226	17	−1006	1040
Digiwalker	38	−248	323	240	−1028	1508
Moves app	−319	−1037	399	1529	−1046	4104

^a Positive values indicate an underestimation of the activity tracker and negative values indicate an overestimation

ISSN: 2052-1847