An expert-based job exposure matrix for large scale epidemiologic studies of primary hip and knee osteoarthritis: The Lower Body JEM

Table 1 Distribution of exposures across 121 job groups comprising 686 occupational titles in The Lower Body Job Exposure Matrix

Exposure	Grand mean	10^thpercentile	50^thpercentile	90^thpercentile
Standing/walking (hours/day)	5.3	3.0	5.7	6.6
Kneeling/squatting (hours/day)	0.4	0	0.2	1.1
Whole-body vibration (hours/day)	0.1	0	0	0.2
Total load lifted (kg/day)	955	193	590	2525
Frequency of lifting loads weighing ≥20 kg (times/day)	10.2	1.2	6.0	21.5

The table excludes 1421 occupational titles estimated to entail mechanical exposures below the screening levels* for all five exposures.
*Standing/walking ≥6 hours/day, kneeling/squatting > ½ hour/day, whole-body vibration >2 hours/day, lifting >2 tons/day, or lifting loads weighing ≥20 kg ≥10 times/day.

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