Table 1. Comparison of p values for median frequency between low back pain (LBP) and controls at each percentage of HAT (head, arms, trunk segment).
| %HAT | LBP vs. Control | Between groups at each %HAT | 
|  |  | 100% | 120% | 140% | 160% | 
| Left ULES | .176 | .615 | .233 | .101 | .236 | 
| Right ULES | .267 | .463 | .147 | .086 | .287 | 
| Left LLES | .453 | .850 | .968 | .090 | .402 | 
| Right LLES | .685 | .867 | .708 | .160 | .540 | 
| Left biceps femoris | .132 | .631 | .099 | .037* | .415 | 
| Right biceps femoris | .004* | .677 | .057 | .065 | .037* | 
ULES: Upper lumbar erector spinae. LLES: Lower lumbar erector spinae.* p ≤ 0.05