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Table 1 Regression models of prediction error for walking speed and VO2 by calibration method

From: Validity of treadmill- and track-based individual calibration methods for estimating free-living walking speed and VO2 using the Actigraph accelerometer

  Prediction error for speed of walking (km · h−1) Prediction error for VO2 (ml · kg−1 · min−1)
Regression parameter Treadmill method Track method Treadmill method Track method
  Coefficient (95 % CI ) BPV Coefficient (95 % CI) BPV Coefficient (95 % CI) BPV Coefficient (95 % CI) BPV
Intercept 0.71*** (0.56, 0.87) 0.54*** 0.02 (−0.05, 0.08) 0.19*** 4.99*** (3.96, 6.00) 3.26*** 0.33 (−0.06, 0.73) 1.10***
Speed 0.15*** (0.06, 0.24) 0.26*** −0.04 (−0.09, 0.01) 0.08* 1.16*** (0.58, 1.75) 1.57*** −0.29** (−0.49, −0.08) –
(Speed)2 −0.06* (−0.11, −0.01) 0.13* −0.04 (−0.09, 0.01) 0.10** – – – −0.20* (−0.38, −0.02) –
  1. These regression models report on average prediction error by calibration method (see intercept values) and if this error depends on walking speed (see regression coefficients for speed and speed2). Coefficient = regression coefficient; 95 % CI = 95 % confidence interval; BPV = Between-participant variability in regression coefficients (expressed as standard deviations); – = not applicable (not significant regression term or between-participant variability based on a comparison of fixed and random slope models); *p < .05; **p < .01; ***p < .001. Speed (km · h−1) was centered at 5 · 7 km.h−1