Table 4.

Predicted means of steps for each device by age (adjusted for BMI, dominant hand, and sex).

Device	Age 18-39	Age 40-64	Age 65-84
Actigraph, mean (CI)	1008.7 (989.2, 1028.2)	997.2 (976.8, 1017.6)	1002.7(984.4, 1021.1)
Apple Watch, mean (CI)	970.2 (934.4, 1006.0)	980.1 (942.9, 1017.4)	1023.6 (987.0, 1060.2)
Fitbit Surge, mean (CI)	965.0 (930.0, 999.9)	950.8 (913.7, 988.0)	953.3 (917.5, 989.0)
Garmin 735XT, mean (CI)	993.9 (973.5, 1014.4)	1003.3 (983.5, 1023.2)	986.4 (967.7, 1005.0)
Garmin Vivofit, mean (CI)	999.8 (956.3, 1043.4)	1002.9 (957.4, 1048.3)	961.2 (916.3, 1006.2)
iPhone 6S Plus, mean (CI)	1026.5 (964.7, 1088.2)	1045.1 (980.4, 1109.8)	1025.7 (961.4, 1090.1)
Nexus 6P, mean (CI)	1002.4 (956.2, 1048.6)	981.8 (932.8, 1030.9)	908.6 (860.7, 956.4)
Samsung Gear S2, mean (CI)	993.3 (966.6, 1020.1)	966.7 (939.2, 994.3)	976.8 (950.1, 1003.6)