Table 2.

Qualitative description of studies not included in meta-analysis.

References	Main finding on gait outcome pre-post	Main finding on gait outcome pre-ret
Harro et al. (2014a)	Comfortable gait speed (m/s) did improve with 4.53% after training 1.30 (0.19) vs. 1.36 (0.21), however non-significantly (p = 0.13). Fast gait speed (m/s) did significantly improve by 7.45% after training 1.69 (0.27) vs. 1.82 (0.30), p = 0.01.	Comfortable gait speed (m/s) remained increased at retention, 1.39 (0.24) vs. 1.30 (0.19), however these improvements were non-significant (p = 0.12). Improvements in fast gait speed retained after 3 months, 1.69 (0.27) vs. 1.80 (0.33), p = 0.05.
Martelli et al. (2017)	Step length (mm) increased over time in the pooled groups [HOA 14.59 (23.70), PwPD 21.78 (17.09)] (p = 0.003) after 30 min of perturbation training, but no group x time effect was observed (p = 0.497)	Not measured

HOA, Healthy Older Adults; PwPD, People with Parkinson's Disease.