Table 2.

Intensity parameters used to derive background physical activity and physical activity from active travel. (Source: Compendium of Physical Activities (https://sites.google.com/site/compendiumofphysicalactivities/) (Ainsworth et al., 2011)).

Physical activity	Estimate (marginal METs)	Distribution	Description in compendium of physical activities (Ainsworth et al., 2011)
Walking	Mean: 2.5	Lognormal (stddev:1.6)	Mean MET (3.5) refers to METs for “walking for pleasure.” Variability by author judgement.
Cycling	Median: 5.8	LogNormal (gsdev:1.3)	Median MET (6.8) refers to METs for “bicycling, to/from work, self selected pace.” Variability by author judgement.
Household work	Median: 3.5	LogNormal (gsdev:1.5)	Median MET (4.5) refers to METs for “polishing floors, standing, walking slowly, using electric polishing machine.” Variability by author judgement.
Sports	Median:5	LogNormal (gsdev:1.5)	Median MET (6.0) refers to METs for “volleyball, competitive, in gymnasium.” Variability by author judgement.

^aMET is defined as the ratio of activity specific metabolic rate to a standard resting metabolic rate of 1.0 (1.0 kcal/(kg ∗ h) or 4.184 kJ/(kg ∗ h)) ((Ainsworth et al., 2000)). Marginal METs refer to the intensity of activity over and above the resting metabolic rate. Marginal METh/wk are calculated as (MET rate - 1) * hours of activity.