Table 2.

Participant characteristics, ARIC visit 8 (2020), N = 364.

Participant characteristic	Single Task - Gait Mat Population (n = 364)	Single Task – Stopwatch Population (n = 235)	Dual Task - Gait Mat Population (n = 329)
Age (years), mean (SD)	81.8 (4.3)	81.6 (4.3)	81.8 (4.3)
Male sex, n (%)	165 (45.3)	95 (40.4)	159 (48.3)
Body mass index (kg/m2)*, mean (SD)	28.4 (4.8)	28.4 (4.6)	28.3 (4.9)
Education, n (%)
> 12 years	163 (44.8)	93 (39.6)	160 (48.6)
12 years, vocational, or equivalent	167 (45.9)	112 (47.7)	147 (44.7)
< 12 years	34 (9.3)	30 (12.8)	22 (6.7)
Race/center, n (%)
Washington County, Maryland, White	104 (28.6)	102 (43.4)	93 (28.3)
Minneapolis, Minnesota, White	115 (31.6)	10 (4.3)	113 (34.3)
Jackson, Mississippi, Black	69 (19.0)	69 (29.4)	53 (16.1)
Forsyth County, North Carolina, Black	1 (0.3)	1 (0.4)	1 (0.3)
Forsyth County, North Carolina, White	73 (20.1)	51 (21.7)	69 (21.0)
Step length (cm), mean (SD)	57.9 (9.6)	--	52.4 (10.8)
Stride width (cm), mean (SD)	8.7 (3.9)	--	10.3 (4.2)
Stride length (cm), mean (SD)	115.7 (19.2)	--	104.7 (21.6)
Cadence (steps/min), mean (SD)	106.1 (9.8)	--	89.6 (17.1)
Single support (sec), mean (SD)	0.4 (0.0)	--	0.4 (0.1)
Double support (sec), mean (SD)	0.4 (0.1)	--	0.5 (0.3)
Stride time (sec), mean (SD)	1.1 (0.1)	--	1.4 (0.4)
Stance time (sec), mean (SD)	0.7 (0.1)	--	1.0 (0.3)
Step time (sec), mean (SD)	0.6 (0.1)	--	0.7 (0.2)
Swing time (sec), mean (SD)	0.4 (0.0)	--	0.4 (0.1)
Stance %, mean (SD)	65.9 (2.3)	--	67.6 (3.5)
Swing %, mean (SD)	34.1 (2.3)	--	32.4 (3.5)
Double support %, mean (SD)	31.1 (4.7)	--	34.9 (7.3)
Gait speed (cm/s), mean (SD)	103.2 (20.0)	92.9 (18.2)	79.5 (24.1)
Cognition: serial 3 s or serial 2 s* (% correct), mean (SD)	81.3 (16.7)	--	74.6 (24.6)

*BMI collected at ARIC Visit 7.