Table 1.
Distribution of exposures across 121 job groups comprising 686 occupational titles in The Lower Body Job Exposure Matrix
| Exposure | Grand mean | 10 th percentile | 50 th percentile | 90 th percentile |
|---|---|---|---|---|
| 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.