Assessing the effect of loading in all the structures when grouped as functional units would be achieved by relating posture scores A and B to the reporting of pain, ache or discomfort in the whole region. A x2 statistical test was again used and the operators’ rest& were grouped according to whether there was a posture score of 1 or a score greater than ! for both A and B scores. There was a highly significant association (P < 0.01) between both posture scores A and B and reported pain or discomfort in the relevant functional unit regions (see Table 4).