Table 1. Summary of direct observation, Actigraph and Fitbit at first and second measures and combined.
| Direct observation | Actigraph | Fitbit | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Activity | n | mean | SE | (95% CI) | Cv | n | mean | SE | (95% CI) | Cv | n | mean | SE | (95% CI) | Cv |
| Walking step count | |||||||||||||||
| First measures | 21 | 674.8 | 8.9 | (656.3, 693.2) | 6.0 | 25 | 726.1 | 9.0 | (707.5, 744.7) | 6.2 | 25 | 588.1 | 21.8 | (543.1, 633.1) | 18.5 |
| Second measures | 19 | 697.4 | 10.7 | (674.9, 719.9) | 6.7 | 23 | 722.6 | 9.7 | (702.4, 742.8) | 6.5 | 23 | 583.1 | 17.3 | (547.3, 618.9) | 14.2 |
| Average of measures | 23 | 684.0 | 10.0 | (663.2, 704.8) | 7.0 | 25 | 709.8 | 13.0 | (683.0, 736.6) | 9.1 | 25 | 583.6 | 16.1 | (550.4, 616.8) | 13.8 |
| Incline walking step count | |||||||||||||||
| First measures | 22 | 691.0 | 9.2 | (672.0, 710.1) | 6.2 | 25 | 738.3 | 10.7 | (716.3, 760.3) | 7.2 | 25 | 643.3 | 22.2 | (597.4, 689.2) | 17.3 |
| Second measures | 21 | 701.1 | 10.6 | (679.1, 723.1) | 6.9 | 23 | 728.3 | 11.3 | (704.9, 751.8) | 7.5 | 23 | 652.9 | 17.4 | (616.7, 689.0) | 12.8 |
| Average of measures | 24 | 698.9 | 9.0 | (680.3, 717.4) | 6.3 | 25 | 714.2 | 19.3 | (674.3, 754.0) | 13.5 | 25 | 641.5 | 18.5 | (603.2, 679.8) | 14.5 |
| Jogging step count | |||||||||||||||
| First measures | 23 | 945.9 | 9.8 | (925.5, 966.3) | 5.0 | 25 | 1009.4 | 13.2 | (982.1, 1,036.6) | 6.5 | 25 | 960.3 | 19.7 | (919.5, 1,001.0) | 10.3 |
| Second measures | 20 | 944.1 | 10.3 | (922.6, 965.6) | 4.9 | 23 | 1013.2 | 14.5 | (983.1, 1,043.4) | 6.9 | 23 | 977.6 | 18.3 | (939.7, 1,015.5) | 9.0 |
| Average of measures | 24 | 947.2 | 8.9 | (928.8, 965.6) | 4.6 | 25 | 1011.2 | 11.0 | (988.5, 1,033.9) | 5.4 | 25 | 971.1 | 14.7 | (940.8, 1,001.5) | 7.6 |
| Stair stepping | |||||||||||||||
| First measures | 23 | 559.1 | 17.0 | (523.9, 594.4) | 14.6 | 25 | 578.6 | 24.1 | (528.9, 628.2) | 20.8 | 25 | 572.0 | 26.1 | (518.1, 625.8) | 22.8 |
| Second measures | 19 | 582.7 | 19.9 | (541.0, 624.5) | 14.9 | 23 | 538.8 | 23.3 | (490.5, 587.2) | 20.8 | 23 | 584.0 | 20.6 | (541.3, 626.8) | 16.9 |
| Average of measures | 23 | 569.2 | 16.9 | (534.1, 604.3) | 14.2 | 25 | 558.8 | 16.9 | (523.9, 593.7) | 15.1 | 25 | 575.3 | 17.9 | (538.2, 612.3) | 15.6 |
| Energy expenditure–Calories* | |||||||||||||||
| First measures | - | - | - | - | - | 24 | 532.4 | 43.9 | (441.7, 623.2) | 40.4 | 24 | 818.2 | 69.0 | (675.5, 960.9) | 41.3 |
| Second measures | - | - | - | - | - | 23 | 563.1 | 58.1 | (442.7, 683.6) | 49.4 | 23 | 840.1 | 74.4 | (685.7, 994.5) | 42.5 |
| Average of measures | - | - | - | - | 25 | 538.9 | 38.8 | (458.8, 619.0) | 36.0 | 25 | 808.1 | 56.6 | (691.3, 924.9) | 35.0 | |
| Active minutes* | |||||||||||||||
| First measures | - | - | - | - | - | 24 | 53.8 | 4.0 | (45.4, 62.1) | 36.7 | 24 | 33.7 | 3.0 | (27.4, 40.0) | 44.3 |
| Second measures | - | - | - | - | - | 22 | 57.0 | 4.0 | (48.8, 65.2) | 32.6 | 22 | 38.1 | 3.2 | (31.5, 44.7) | 39.3 |
| Average of measures | - | - | - | - | 24 | 54.6 | 2.8 | (48.7, 60.5) | 25.5 | 24 | 35.4 | 2.4 | (30.5, 40.3) | 32.7 | |
SE: standard error, CI: confidence interval, Cv: Coefficient of variation
-: No data available
*: Comparisons are between the Fitbit and Actigraph