Table 1. Summary of physical exposure relative to different postures and activity.

% of shift spent	Maintenance crew	Operators (Truck drivers)
Seated	16.5%±7.8% (n = 4) *	85.9%±8.0% (n = 6)
Standing	67.2%±30.1% (n = 4) *	9.1%±5.9% (n = 5)
Walking	56.1%±32.1% (n = 3) *	8.4%±6.6% (n = 5)

^*  = p<0.05.