Table 4. Monitor-specific hip Euclidean Norm Minus One (ENMO (measured in milligravity units)) thresholds to differentiate between sedentary behaviours and light-intensity physical activities.
| Monitor Placement: Hip | Discrimination | |||||
|---|---|---|---|---|---|---|
| Sedentary Behaviours | ||||||
| vs. | ||||||
| Standing Still | Washing Pots | Dusting | Sweeping Floor | Self-Paced Free-Living Walk | ||
| ENMO Threshold (milligravity) | AG | 2.6 | 2.9 | 7.5 | 9.4 | 26.6 |
| GA | 3.9 | 4.7 | 8.6 | 11.2 | 25.9 | |
| Sensitivity (%) | AG | 52% | 88% | 97% | 100% | 94% |
| GA | 70% | 85% | 97% | 100% | 100% | |
| Specificity (%) | AG | 54% | 59% | 92% | 94% | 100% |
| GA | 35% | 45% | 80% | 87% | 97% | |
| ENMO AUROC † (95% CI) | AG | 0.543 (0.447, 0.640) | 0.779 (0.716, 0.842) | 0.965 (0.947, 0.982) | 0.979 (0.967, 0.992) | 0.994 (0.987, 1.000) |
| GA | 0.504 (0.402, 0.607) | 0.666 (0.578, 0.753) | 0.934 (0.906, 0.962) | 0.961 (0.943, 0.980) | 0.997 (0.993, 1.000) | |
| ENMO LOOCV AUROC ‡ (95% CI) | AG | 0.382 (0.252, 0.491) | 0.689 (0.605, 0.773) | 0.962 (0.943, 0.981) | 0.978 (0.965, 0.991) | 0.993 (0.986, 1.000) |
| GA | 0.332 (0.212, 0.451) | 0.600 (0.499, 0.701) | 0.930 (0.900, 0.959) | 0.958 (0.939, 0.978) | 0.996 (0.992, 1.000) | |
Sedentary behaviours = any form of lying plus any form of sitting (activities 1 to 11); ENMO = Euclidean Norm Minus One (measured in milligravity units); AG = ActiGraph GT3X+ accelerometer; GA = GENEActiv accelerometer
† Area under Receiver-Operating-Characteristic curve
‡ Leave-One-Out-Cross-Validation Area under Receiver-Operating-Characteristic curve