Fig. 1

Prediction error of walking speed on the free-living walks for treadmill- and track-based calibration methods. Figure 1 shows the relationship between mean prediction error for walking speed (km · h⁻¹) and actual walking speed (km · h⁻¹) on the free-living walks for the treadmill- (left) and track-based (right) calibration methods. Dashed lines are 95 % confidence intervals