Study ID.	Author	Treadmill or Overground Walking?	Prioritization of Dual Task?	Additional Noise Processing?
1	Beurskens 2014 [41]	Treadmill	No	Yes
2	Chen 2017 [57]	Overground	Pay equal attention	Yes
3	Fraser 2016 [59]	Treadmill	Pay equal attention	NR
4	George 2019 [60]	Overground	Pay equal attention	NR
5	Holtzer 2011 [35]	Overground	Pay equal attention	Yes
6	Holtzer 2016 [36]	Overground	Pay equal attention	Yes
7	Holtzer 2016 [37]	Overground	Pay equal attention	Yes
8	Holtzer 2017 [34]	Overground	Pay equal attention	Yes
9	Holtzer 2018 [33]	Overground	Pay equal attention	Yes
10	Holtzer 2019 [31]	Overground	Pay equal attention	Yes
11	Holtzer 2019 [32]	Overground	Pay equal attention	Yes
12	Lin 2016 [38]	Overground	No	Yes
13	Lu 2015 [40]	Overground	Yes	Yes
14	Lucas 2019 [42]	Overground	Pay equal attention	Yes
15	Meester 2014 [45]	Treadmill	No	NR
16	Metzger 2017 [46]	Treadmill	No	NR
17	Mirelman 2014 [48]	Overground	No	Yes
18	Mirelman 2017 [47]	Overground	No	Yes
19	Osofyundiya 2016 [51]	Overground	Pay equal attention	NR
20	Stuart 2018 [54]	Treadmill	No	Yes
21	Verghese 2016 [55]	Overground	Pay equal attention	Yes
22	Wagshul 2019 [56]	Overground	Pay equal attention	Yes
23	Al-Yahya 2019 [29]	Treadmill	No	Yes
24	Maidan 2016 [44]	Overground	No	Yes
25	Maidan 2018 [43]	Treadmill	No	Yes
26	Nieuwhof 2016 [50]	Overground	NR	NR
27	Al-Yahya 2016 [30]	Treadmill	No	Yes
28	Chatterjee 2019 [63]	Overground	No	NR
29	Hermand 2019 [61]	Overground	Pay equal attention	Yes
30	Liu 2018 [39]	Overground	No	Yes
31	Mori 2017 [49]	Overground	No	NR
32	Chaparro 2017 [52]	Treadmill	No	Yes
33	Hernandez 2016 [62]	Overground	No	Yes
34	Saleh 2018 [53]	Overground	Pay equal attention	Yes
35	Doi 2013 [58]	Overground	No	NR
Note: NR = Not reported.