Table 1. Comparison of anterior and posterior pressure values and anterior-to-posterior ratios of the four backpack positions.

	Condition-1	Condition-2	Condition-3	Condition-4
Anterior pressure values	39.45±10.96	42.04±12.16	40.64±13.51	37.50±11.18†‡
Posterior pressure values	60.56±10.96	57.96±12.16	59.36±13.51	62.51±11.18†‡
Anterior-to-Posterior ratio	0.72±0.39	0.82±0.48	0.80±0.54	0.65±0.31†‡

Condition-1: no backpack; Condition-2: carrying the backpack at C7; Condition-3: carrying the backpack at 10 cm below C7; and Condition-4: carrying the backpack at 20 cm below C7. ^†Significant difference from condition-2. ^‡Significant difference from condition-3.