| Spinal pain | N | Mean (sd) | Std. error | Mean difference (95% CI) | P value |
---|---|---|---|---|---|---|
Container weight (kg) | No | 4 | 13.7 (8.5) | 4.2 | 8.2 (-21.4-4.9) | 0.146 |
 | Yes | 15 | 22.0 (3.2) | .8 |  |  |
Distance (m) 1 | No | 5 | 470 (132) | 59 | 173 (2-343) | 0.048 |
 | Yes | 15 | 297 (188) | 49 |  |  |
Carrying time (min) | No | 5 | 7 (1) | 37.2 | 2.6 m (10sec-5 m) | 0.038 |
 | Yes | 15 | 5 (4) | 58.7 |  |  |
TDCT (min) 2 | No | 4 | 22 (7) | 3.5 | 7.1 (-5.5-19.8) | 0.240 |
 | Yes | 9 | 15 (14) | 4.5 |  |  |
CW/BW% | No | 4 | 40 (19) | 9.3 | 2 (-29.6-25.7) | 0.856 |
 | Yes | 15 | 42 (15) | 3.9 |  |  |
RPE | No | 4 | 6.2 (4.3) | 2.2 | 1.0 (-7.6-5.6) | 0.681 |
 | Yes | 15 | 7.3 (2.6) | 0.2 |  |  |