Table 3 Validity indices (accuracy, bias, and precision) averaged across all wearable technologies and presented by age group
| Â | Treadmill speed, km/h (mph) | Â | Â | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
Slow | Normal | Fast | ||||||||
0.8 (0.5) | 1.6 (1.0) | 2.4 (1.5) | 3.2 (2.0) | 4.0 (2.5) | 4.8 (3.0) | 5.6 (3.5) | 6.4 (4.0) | 7.2 (4.5) | 8.0 (5.0) | |
Children (6–12 years) | ||||||||||
 MAPE ± SD | 76.7 ± 30.0 | 58.2 ± 36.2 | 38.0 ± 32.6 | 24.1 ± 30.1 | 17.3 ± 29.3 | 16.0 ± 28.3 | 16.3 ± 28.9 | 18.5 ± 28.1 | 24.1 ± 30.2 | – |
 MPE ± SD | −76.7 ± 30.0 | − 57.6 ± 37.1 | −37.6 ± 33.1 | −22.8 ± 31.0 | − 16.7 ± 29.6 | − 14.3 ± 29.2 | −15.3 ± 29.4 | −17.5 ± 28.8 | −22.4 ± 31.5 | – |
Adolescents (13–17 years) | ||||||||||
 MAPE ± SD | 81.2 ± 30.0 | 61.7 ± 37.7 | 39.4 ± 33.6 | 23.6 ± 29.9 | 17.0 ± 30.0 | 14.9 ± 29.1 | 14.6 ± 28.7 | 16.0 ± 28.8 | 18.6 ± 29.3 | 16.5 ± 25.1 |
 MPE ± SD | −80.9 ± 31.2 | − 60.8 ± 39.1 | −38.2 ± 35.0 | −22.3 ± 30.9 | −16.0 ± 30.5 | −14.0 ± 29.6 | −13.5 ± 29.2 | −15.1 ± 29.3 | −17.6 ± 29.9 | −15.4 ± 25.8 |
Young adults (18–20 years) | ||||||||||
 MAPE ± SD | 80.6 ± 31.9 | 60.6 ± 38.7 | 36.9 ± 35.5 | 21.0 ± 28.8 | 15.8 ± 29.4 | 14.9 ± 29.5 | 14.4 ± 28.7 | 14.9 ± 28.4 | 16.2 ± 28.9 | 20.4 ± 28.4 |
 MPE ± SD | − 80.6 ± 32.1 | − 59.7 ± 40.0 | −35.4 ± 37.1 | −19.6 ± 29.8 | −14.8 ± 29.9 | −14.8 ± 29.9 | −13.8 ± 29.1 | −13.9 ± 28.9 | −15.3 ± 29.4 | −16.6 ± 30.9 |