. 2007 Sep 27;4:45. doi: 10.1186/1479-5868-4-45

Table 3.

Doer sub-sample accumulated daily minutes in walking behaviours, sports and exercise, and total physical activity

	Minutes doers spent in activity

	1965	1975	1985	1992–1994	2003

Physical activity variable	mean (95% CI)	mean (95% CI)	mean (95% CI)	mean (95% CI)	mean (95% CI)
	median (P_25;P₇₅)	median (P_25;P₇₅)	median (P_25;P₇₅)	median (P_25;P₇₅)	median (P_25;P₇₅)
Any walking	46.2	51.9	44.8	40.2	44.9
	(36.7; 55.7)	(37.2; 66.6)	(40.8; 48.8)	(37.4; 43.1) 20	(43.0; 46.7)
	43	30	30	(10; 50)	30
	(23; 60)	(30; 60)	(20; 60)		(10; 60)
Walking for exercise	46.2	51.9	42.0	NA	52.4
	(36.7; 55.7)	(37.2; 66.6)	(37.1; 47.0)		(49.6; 55.2)
	43	30	30		45
	(23; 60)	(30; 60)	(29; 60)		(30; 60)
Walking for transport	NA	NA	53.8	32.7	31.4
			(44.2; 63.5)	(30.2; 35.2)	(29.9; 32.8)
			45	20	20
			(30; 60)	(8; 45)	(6; 42)
Walking the dog	NA	NA	38.8	55.9	42.5
			(34.1; 43.6)	(48.4; 63.4)	(39.4; 45.5)
			30	30	30
			(15; 50)	(20; 60)	(20; 60)
Sports/exercise **	95.1	108.3	87.7	122.1	89.6
	(80.0; 110.2)	(94.6; 122.0)	(81.1; 94.3)	(116.0; 128.2)	(86.5; 92.6)
	90	85	60	80	60
	(25; 150)	(40; 143)	(30; 120)	(45; 160)	(40; 120)
Total physical activity***	81.8	98.5	75.1	91.9	69.4
	(70.0; 93.6)	(86.7; 110.3)	(70.3; 79.9)	(87.7; 96.0)	(67.4; 71.3)
	60	60	55	60	50
	(25; 130)	(30; 126)	(30; 97)	(20; 120)	(20; 90)

*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