Table 3. Estimated false positives generated daily based on conservative estimates of time spent on sample activities for different categories of potential activity monitor users over a typical 12-hour day.
| Taxi Driver (5000 steps/day) | Office Worker (6250 steps/day) | School Teacher (8750 steps/day) | Student Football Player (12000 steps/day) | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| T/D | AM 1 | AM 2 | AM 3 | AM 4 | T/D | AM 1 | AM 2 | AM 3 | AM 4 | T/D | AM 1 | AM 2 | AM 3 | AM4 | T/D | AM 1 | AM2 | AM3 | AM4 | |
| Deskwork (min) | - | - | - | - | - | 360 | 0 | 0 | 0 | 0 | 120 | 0 | 0 | 0 | 0 | 120 | 0 | 0 | 0 | 0 |
| 3rd floor elevator (min) | - | - | - | - | - | 15 | 15 | 0 | 0 | 0 | 5 | 5 | 0 | 0 | 0 | - | - | - | - | - |
| Bus journey (min) | - | - | - | - | - | 60 | 120 | 0 | 60 | 60 | - | - | - | - | - | 60 | 120 | 0 | 60 | 60 |
| Driving: Local road (km) | 40 | 320 | 40 | 400 | 40 | - | - | - | - | - | 10 | 80 | 10 | 100 | 10 | - | - | - | - | - |
| Driving: Urban road (km) | 35 | 70 | 0 | 105 | 0 | - | - | - | - | - | 10 | 20 | 0 | 30 | 0 | - | - | - | - | - |
| Driving: Category A Road (km) | - | - | - | - | - | - | - | - | - | - | 5 | 0 | 0 | 10 | 0 | - | - | - | - | - |
| Driving: Category B Road (km) | - | - | - | - | - | - | - | - | - | - | 5 | 0 | 0 | 5 | 25 | 10 | 0 | 0 | 10 | 50 |
| Driving: Category C Road (km) | - | - | - | - | - | 30 | 0 | 150 | 120 | 540 | 5 | 0 | 25 | 20 | 90 | 10 | 0 | 50 | 40 | 180 |
| Driving: Motorway (km) | - | - | - | - | - | - | - | - | - | - | 10 | 0 | 0 | 0 | 0 | - | - | - | - | - |
| Washing and drying dishes (min) | 20 | 460 | 0 | 0 | 0 | 20 | 460 | 0 | 0 | 0 | 20 | 460 | 0 | 0 | 0 | 20 | 460 | 0 | 0 | 0 |
| Functional reaching task (min) | 15 | 405 | 0 | 30 | 0 | 30 | 810 | 0 | 60 | 0 | 20 | 540 | 0 | 40 | 0 | 60 | 1620 | 0 | 120 | 0 |
| Total (false positives) | 1255 | 40 | 535 | 40 | 1405 | 150 | 240 | 600 | 1105 | 35 | 205 | 125 | 2200 | 50 | 230 | 290 | ||||
| % of the average daily step count that is false | 25.1 | 0.8 | 10.7 | 0.8 | 22.5 | 2.4 | 3.8 | 9.6 | 12.6 | 0.4 | 2.3 | 1.4 | 18.3 | 0.4 | 1.9 | 2.4 | ||||
Values for the automobile driving activity are expressed as the number of false positives detected per kilometer driven. Values for all other activities are expressed as the number of false positives detected per minute. The ActivPAL™ monitor has been excluded from this table, as it correctly did not register any false positives during the included sample activities. T/D = Time in minutes/Distance in kilometers; AM = Activity Monitor. AM 1 = Jawbone™; AM 2 = Withings™; AM 3 = NL-2000™; AM 4 = Fitbit™.