Table 1.
Demographics of the participants and the devices they used.
| Younger (Y) participant group | Older (O) participant group | ||||||||
| ID | Gendera | Age (years) | Type of device | Duration of use | ID | Gender | Age (years) | Type of device | Duration of use |
| Y1 | M | 20 | Fossil smartwatch | 1 year | O1 | F | 89 | Fitbit | 3 years |
| Y2 | F | 19 | Fitbit | 2 years | O2 | F | 69 | Fitbit | 4 years |
| Y3 | M | 21 | Frontier smartwatch | 2 years | O3 | F | 69 | iPhone Health app | 4 years |
| Y4 | M | 19 | Fitbit | 2 years | O4 | F | 72 | Fitbit | 5 years |
| Y5 | F | 21 | Fitbit | 7 months | O5 | F | 69 | Fitbit | 6 months |
| Y6 | M | 22 | Fitbit | 1 year | O6 | M | 66 | Fitbit | 2 years |
| Y7 | M | 19 | Apple watch | 3 years | O7 | M | 78 | Fitbit, iPhone Health app | 3 years |
| Y8 | M | 24 | Garmin smartwatch | 2 months | O8 | F | 80 | Fitbit | 1 year |
| Y9 | F | 20 | Fitbit | 18 months | O9 | F | 71 | iPhone Health app | 3 years |
| Y10 | F | 21 | Fitbit | 2 years | O10 | F | 70 | Fitbit, H-Band | 5 years |
| Y11 | M | 18 | Fitbit | 3 months | O11 | F | 72 | Fitbit | 6 years |
| Y12 | M | 20 | Fitbit, MyKronoz | 1 year | O12 | M | 67 | iPhone Health app | 5 years |
| Y13 | M | 20 | Fitbit, iPhone Health app | 2 years | O13 | M | 69 | iPhone Health app | 2 months |
| Y14 | M | 19 | Apple watch | 18 months | O14 | F | 65 | Fitbit | 1 year |
| Y15 | F | 19 | iPhone Health app, Apple watch, Lose it app | 6 years | O15 | F | 67 | Fitbit, Weight Watchers app, My Fitness Pal app | 3 years |
aGender: male (M), female (F).