Table 2 . Results of independent t test comparing of hip extension and ankle dorsiflexion(plantar flexors length) ranges and spinal curves between the young and old groups .
| Variables (measurement unit) | Group(Mean±SD) | Mean differences | p | |
| young | old | |||
| Lumbar curve (degree) | 31.29±6.37 | 27.93±8.11 | 3.36 | 0.08 |
| Thoracic curve (degree) | 34.43±13.27 | 36.19±8.97 | 1.76 | 0.55 |
| Right Hip extension range (degree) | 24±4.70 | 13.6±5.99 | 3.40 | p<0.001 |
| Left Hip extension range (degree) | 16.37±3.08 | 8.72±4.56 | 9.97 | p<0.001 |
| Right Ankle dorsiflexion range (degree) | 17.230±3.19 | 6.57±8.30 | 10.66 | p<0.001 |
| Left Ankle dorsiflexion range (degree) | 16.83±3.10 | 6.86±8.40 | 10.94 | p<0.001 |