Table 3 Cadence thresholds (steps/min) for absolutely-defined moderate and vigorous intensity based on regression and ROC curve analyses
From: Walking cadence (steps/min) and intensity in 61–85-year-old adults: the CADENCE-Adults study
Intensity METs | Measure | Regression thresholds | ROC thresholds | Heuristic thresholds | ||
|---|---|---|---|---|---|---|
Value | 95% PI | Value | 95% CI | Value | ||
3 | Threshold (steps/min) | 103.1 | 70.0–114.2 | 100.3 | 95.7–103.1 | 100 |
Se | 81.6 | – | 86.8 | – | 86.8 | |
Sp | 86.6 | – | 84.5 | – | 83.3 | |
PPV | 80.5 | – | 79.2 | – | 78.0 | |
NPV | 87.4 | – | 90.4 | – | 90.3 | |
Accuracy | 84.6 | – | 85.5 | – | 84.8 | |
AUC | – | – | 0.93 | 0.91–0.95 | – | |
4 | Threshold (steps/min) | 116.4 | 105.3–127.4 | 111.5 | 106.1–112.9 | 110 |
Se | 68.2 | – | 88.2 | – | 89.4 | |
Sp | 93.5 | – | 87.3 | – | 84.1 | |
PPV | 65.2 | – | 55.1 | – | 50.0 | |
NPV | 94.3 | – | 97.7 | – | 97.8 | |
Accuracy | 89.7 | – | 87.4 | – | 84.9 | |
AUC | – | – | 0.94 | 0.92–0.96 | – | |
5 | Threshold (steps/min) | 129.6 | 118.6–140.7 | 116.0 | 112.4–120.2 | 120 |
Se | 44.4 | – | 96.3 | – | 81.5 | |
Sp | 98.5 | – | 87.9 | – | 91.6 | |
PPV | 60.0 | – | 28.6 | – | 32.8 | |
NPV | 97.2 | – | 99.8 | – | 99.0 | |
Accuracy | 95.9 | – | 88.3 | – | 91.1 | |
AUC | – | – | 0.96 | 0.94–0.98 | – | |
6 | Threshold (steps/min) | 142.9 | 131.8–148.4 | 128.6 | 128.3–136.4 | 130 |
Se | 33.3 | – | 100.0 | – | 83.3 | |
Sp | 99.8 | – | 97.1 | – | 97.5 | |
PPV | 66.7 | – | 27.3 | – | 26.3 | |
NPV | 99.3 | – | 100.0 | – | 99.8 | |
Accuracy | 99.1 | – | 97.2 | – | 97.3 | |
AUC | – | – | 0.99 | 0.98–1.00 | – | |