Table 1. Demographic and Health Characteristics by Level of Mid-life Physical Activity (n = 4753).

	Mid-life PA (n=4753)
	Inactive Group (n=3275)		Active Group (n=1478)
Variable	Mean	SD	Mean	SD	P (age adj.)
Follow-up time, mean (± SD), y	25.5	(4.0)	24.4	(4.5)	<.001
Female no. (%)	1912	(58.4 )	830	(56.2)	.138
Elementary education, primary only, no. (%)	837	(25.6)	221	(15.0)	<.001
Mid-life Examination
Age, mean (± SD), y	50.9	(6.5)	51.7	(7.2)
Body mass index, mean (± SD)	25.2	(3.6)	25.1	(3.1)	.385
Systolic blood pressure, mean (± SD), mmHg	131.0	(19.0)	130.2	(18.2)	.269
Cholesterol, mean (± SD), mmol/l	6.4	(1.1)	6.3	(1.1)	.748
Midlife never smoked, no. (%)	1281	(39.2)	619	(41.9)	.053
Current Examination
Age, mean (± SD), y	76.4	(5.5)	76.0	(5.4)
Body mass index, mean (± SD)	27.2	(4.5)	26.9	(4.2)	.063
Systolic blood pressure, mean (± SD), mmHg	142.6	(20.2)	141.7	(20.0)	.224
Cholesterol, mean (± SD), mmol/L	5.7	(1.2)	5.6	(1.2)	.111
MMSE, mean (± SD)	26.7	(2.7)	27.2	(2.6)	<.001
Diabetes, no. (%)	399	(12.2)	163	(11.0)	.251
Coronary event, no. (%)	469	(14.3)	217	(14.7)	.832
Self reported stroke, no. (%)	186	(5.7)	89	(6.0)	.731
High depressive symptoms#, no. (%)	219	(6.7)	75	(5.1)	.083
Never smoked, no. (%)	1310	(40.9)	660	(45.6)	.002
PA hours/week in the past 12 month, mean (± SD)	1.0	(2.0)	1.8	(2.5)	<.001
Lower Extremity Function
Gait speed, mean (± SD), meter/sec	0.9	(0.2)	1.0	(0.2)	<.001
Timed up and go, mean (± SD), sec	12.5	(3.3)	11.8	(3.0)	<.001
Knee extension, mean (± SD), kg	32.0	(11.6)	34.1	(12.2)	<.001

^#15-item Geriatric Depression Scale score ≥6

Abbreviations: PA = physical activity, MMSE = mini mental state examination, SD = standard deviation, no = number, sec = second