Table 4.
Minimum number of days required for weekly and monthly level of daily step count with ICC ≥ 80% and the corresponding MAPE, under different settings.
| Settings | Simple random days | Random consecutive days | ||
|---|---|---|---|---|
| Minimum number of days | MAPE (%) | Minimum number of days | MAPE (%) | |
| Weekly time window | ||||
| All participants, the same calendar days in all participants (N = 212,048) | 2.5 (0.5) | 14.3 (2.5) | 2.6 (0.5) | 14.8 (2.1) |
| Participants who recorded step count for at least one complete month (N = 112,865) | 2.5 (0.5) | 13.8 (2.4) | 2.7 (0.5) | 13.8 (2.0) |
| Participants who recorded step count for all 155 days (N = 8185) | 2.0 (0.2) | 13.7 (1.0) | 2.1 (0.4) | 14.0 (1.6) |
| Participants who recorded daily step count prior to the intervention (N = 44,469) | 3.0 (0.0) | 14.4 (0.6) | 3.0 (0.0) | 15.0 (0.5) |
| Monthly time window | ||||
| All participants, the same calendar days in all participants (N = 212,048) | 3.4 (0.5) | 13.5 (1.4) | 4.2 (1.3) | 13.2 (1.8) |
| Participants who recorded step count for at least one complete month (N = 112,865) | 3.4 (0.5) | 13.4 (1.5) | 4.4 (0.5) | 12.9 (1.1) |
| Participants who recorded step count for all 155 days (N = 8185) | 3.0 (0.0) | 13.0 (0.5) | 3.4 (0.5) | 13.4 (1.1) |
| Participants who recorded daily step count prior to the intervention (N = 16,460) | 3.3 (0.6) | 15.9 (1.2) | 3.7 (0.6) | 15.8 (0.5) |
Data are in mean (SD) of results over 22 separate weeks or five separate months.
ICC intraclass correlation coefficients, MAPE mean absolute percentage errors.