# Table 2

Various reported physical activities at follow-up in relation to frequency of activity at baseline

Hours and excess MET-hours a per week spent doing various activities reported ~3 years after baseline

walking

cycling

gardening

housework

hours

mean

MET-hours

mean (SD)

hours

mean

MET-hours

mean (SD)

hours

mean

MET-hours

mean (SD)

hours

mean

MET-hours

mean (SD)

Baseline reported frequency

of strenuous physical activity

n = 589,632

n = 589,632

n = 589,632

n = 589,632

Never

3.9

9.7 (12.8)

0.1

0.9 (5.7)

2.4

7.3 (9.9)

14.4

28.8 (23.0)

< Once per week

4.4

11.1 (12.1)

0.2

1.5 (6.8)

3.1

9.4 (10.8)

13.8

27.5 (21.2)

Once per week

4.8

12.0 (12.4)

0.3

1.9 (7.7)

3.3

9.8 (11.0)

13.5

27.0 (21.1)

2 to 3 times per week

5.2

13.1 (13.2)

0.4

2.8 (9.8)

3.5

10.5 (12.1)

13.3

26.6 (21.0)

4 to 6 times per week

5.9

14.8 (14.9)

0.6

4.4 (13.1)

3.8

11.4 (13.9)

13.4

26.7 (21.6)

Daily

7.5

18.6 (20.4)

0.6

4.4 (16.5)

4.1

12.3 (15.7)

15.4

30.9 (25.7)

Correlation coefficient

0.18

0.15

0.15

-0.03

P for trend

< 0.0001

< 0.0001

< 0.0001

< 0.0001

Baseline reported frequency

of any physical activity

n = 589,896

n = 589,896

n = 589,896

n = 589,896

Never

3.2

7.9 (12.7)

0.1

0.6 (4.9)

2.2

6.7 (9.8)

14.7

29.3 (23.7)

< Once per week

3.3

8.2 (11.2)

0.1

0.9 (4.7)

2.6

7.9 (9.8)

13.7

27.3 (21.8)

Once per week

3.7

9.2 (11.3)

0.2

1.3 (6.1)

2.8

8.4 (10.0)

13.5

27.0 (21.6)

2 to 3 times per week

4.4

11.0 (11.5)

0.3

1.8 (7.6)

3.0

9.1 (10.6)

13.4

26.8 (20.8)

4 to 6 times per week

5.2

13.0 (12.1)

0.4

2.7 (9.1)

3.2

9.6 (11.2)

13.5

27.0 (20.5)

Daily

6.5

16.3 (15.9)

0.4

2.6 (10.9)

3.6

10.8 (13.0)

14.8

29.6 (23.3)

Correlation coefficient

0.31

0.11

0.14

0.01

P for trend

< 0.0001

< 0.0001

< 0.0001

0.002

a Excess MET-hours: metabolic equivalent hours of energy expenditure in excess of basal metabolic rate; see Methods for details.

Armstrong et al. BMC Medical Research Methodology 2011 11:97   doi:10.1186/1471-2288-11-97