Table 2

Median stride duration (ms)

Group	Cognitive task	Single task Mean (SD)	Dual task Mean (SD)	% Decrement
Patients (n=50)	Word generation	1238 (725)	1325 (800)	7^2-160
(n=32)		Mental arithmetic	1366 (629)	1472 (786)	8^2-150
		Paired associate monitoring	1261 (770)	1334 (866)	6^2-160
		Visuospatial decision	1208 (754)	1293 (810)	7^2-160
Controls (n=9)	Word generation	579 (117)	634 (166)	9(^2-150)
(n=10)	Paired associate monitoring	578 (122)	570 (140)	−1
(n=10)	Visuospatial decision	519 (116)	504 (151)	−3

(^2-150) p<0.10;
↵2-150 p<0.05;
↵2-160 p<0.01.
Control scores are not reported for stride duration during mental arithmetic because only three controls performed this task. A negative % decrement indicates better performance under dual task conditions.