Table 2.

Prevalence*of walking behaviours, sports and exercise, and total physical activity

	Proportion of doers
	1965	1975	1985	1992–1994	2003
	(N = 1651)	(N = 1555)	(N = 2923)	(N = 7527)	(N = 19714)
Physical activity variable	n	n	n	n	n
	%	%	%	%	%
	(95% CI)	(95% CI)	(95% CI)	(95% CI)	(95% CI)
Any walking	39	57	443	1577	3720
	2.4	3.7	15.2	21.0	18.9
	(1.6; 3.1)	(2.7; 4.6)	(13.9; 16.5)	(20.0; 21.9)	(18.3; 19.4)
Walking for exercise	39	57	85	NA	1073
	2.4	3.7	2.9		5.4
	(1.6; 3.1)	(2.7; 4.6)	(2.3; 3.5)		(5.1; 5.8)
Walking for transport	NA	NA	105	1244	2845
			3.6	16.5	14.4
			(2.9; 4.3)	(15.7; 17.4)	(13.9; 14.9)
Walking the dog	NA	NA	275	408	506
			9.4	5.4	2.6
			(8.3; 10.5)	(4.9; 5.9)	(2.3; 2.8)
Sports/exercise**	97	188	501	1438	2427
	5.9	12.1	17.1	19.1	12.3
	(4.7; 7.0)	(10.5; 13.7)	(15.8; 18.5)	(18.2; 20.0)	(11.9; 12.8)
Total physical activity***	134	237	850	2602	5540
	8.1	15.2	29.1	34.6	28.1
	(6.8; 9.4)	(13.5; 17.0)	(27.4; 30.7)	(33.5; 35.6)	(27.5; 28.7)

NA = data not available; *Prevalence estimates age-standardized to the 2000 US. census population using age groups 18–24 years, 25–34 years, 35–44 years, 45–64 years, and 65 years or older; **walking for exercise not included, with the exception of 1992–1994 which might have contained walking for exercise; ***all walking and sports/exercise considered, no double-counting