Fig. 5

Subgroup analysis describing the validity of stride length measured using IMU (Intraclass correlation coefficient, ICC). A based on running speed, B based on location and C based on running surface. Squares represent Fisher’s Z; bars indicate 95% confidence intervals and diamonds as pooled data. Deflandre et al. 2018a (8 km/h, IMUs vs optical motion capture system), 2018b (16 km/h, IMUs vs optical motion capture system), 2018c (8 km/h, IMUs vs Optogait), 2018d (16 km/h, IMUs vs Optogait) [37]; Koldenhoven and Hertel, 2018a (left limb), 2018b (right limb) [45]. SE standard error, IV inverse variance, CI confidence interval.