Table 1

Excess MET-hours a for activity at follow-up in relation to baseline frequency of activity

Hours and excess MET-hours a per week spent doing various

activities reported ~3 years after baseline



Strenuous activity b

Aggregate of various activities c

Frequency of strenuous physical

activity reported at baseline

Number

of women

hours

mean

MET-hours a

mean (SD)

hours

mean

MET-hours a

mean (SD)



Never

261,857

0.8

5.6 (21.3)

21.7

52.4 (39.0)

< Once per week

79,962

1.1

7.8 (20.2)

22.7

57.3 (38.0)

Once per week

115,573

1.5

10.7 (20.5)

23.4

61.5 (38.5)

2 to 3 times per week

96,415

2.4

16.5 (25.0)

24.8

69.5 (42.5)

4 to 6 times per week

19,394

3.4

23.9 (34.1)

27.2

81.3 (50.6)

Daily

16,431

3.5

24.3 (50.8)

31.1

90.6 (69.1)

Correlation coefficient

0.37

0.12

0.22

P for trend

< 0.0001

< 0.0001

< 0.0001


Frequency of any physical

activity reported at baseline


Never

107,346

0.8

5.8 (24.5)

21.0

50.3 (41.4)

< Once per week

49,073

0.9

6.6 (21.2)

20.6

50.9 (37.8)

Once per week

92,317

1.2

8.1 (19.5)

21.3

53.9 (37.0)

2 to 3 times per week

149,138

1.6

11.4 (20.6)

22.7

60.0 (37.5)

4 to 6 times per week

57,585

2.0

13.8 (24.0)

24.2

66.0 (39.6)

Daily

134,437

1.7

12.0 (30.0)

27.0

71.2 (49.0)

Correlation coefficient

0.17

0.17

0.22

P for trend

< 0.0001

< 0.0001

< 0.0001


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

b Reported hours and estimated excess MET-hours a spent doing exercise causing sweating or a fast heartbeat

c Reported hours and estimated excess MET-hours a spent doing walking, cycling, gardening, housework, and exercise causing sweating or a fast heartbeat

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

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