5. There is more than sixfold increase in the risk for reporting LBP for workers with high levels of exposure to all four major risk factors indentified: peak shear; integrated lumbar moment over the duration of the shift; peak torso flexion velocity; and usual hand force over the course of the shift.
6. Although the best statistical model included the combinations of variables listed in no. 5, above, very little predictive power was lost by substituting variables such as spinal compression or moment, which were eliminated from the ‘best’ multivariable model because of high correlation with spinal shear force. It would, therefore, be unwise to dismiss
compression or moment as risk factors only because they did not emerge in the best multivariable statistical
model.