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The coefficient of variation (CoV) of contact time, swing time, stride frequency and stride length as a function of self-selected walking speed (SSWS), and two relative speeds below and two above SSWS in patients with interstitial lung disease (ILD, filled columns) and controls (empty columns). The main [group (ILD × CON) and velocity (VEL)] and interaction (GROUP × VEL) effects are denoted.
