Table 2.

Differences between the total FPI scores and those for the six index criteria according to backpack use.

FPI	All			Backpack			Non-Backpack
	Initial	Repeat	p-Value	Initial	Repeat	p-Value	Initial	Repeat	p-Value
Talar head palpation	0.69 ± 0.50	0.61 ± 0.53	0.01	0.70 ± 0.50	0.62 ± 0.54	0.003	0.65 ± 0.50	0.57 ± 0.50	0.090
Curves at malleolus	0.30 ± 0.49	0.28 ± 0.49	0.526	0.29 ± 0.48	0.29 ± 0.49	0.999	0.30 ± 0.52	0.24 ± 0.48	0.250
Inversion/Eversion calcaneus	0.31 ± 0.49	0.29 ± 0.49	0.682	0.29 ± 0.49	0.29 ± 0.49	0.999	0.35 ± 0.50	0.31 ± 0.49	0.440
TNJ prominence	0.30 ± 0.51	0.33 ± 0.48	0.166	0.32 ± 0.51	0.33 ± 0.48	0.618	0.25 ± 0.51	0.33 ± 0.49	0.080
5 Congruence of medial arch	0.37 ± 0.52	0.36 ± 0.52	0.843	0.38 ± 0.51	0.37 ± 0.50	0.874	0.34 ± 0.55	0.33 ± 0.56	0.906
Ab/adduction forefoot-rearfoot	0.48 ± 0.54	0.43 ± 0.50	0.034	0.51 ± 0.54	0.43 ± 0.50	0.011	0.41 ± 0.52	0.42 ± 0.50	0.899
Total SCORE FPI	2.42 ± 1.55	2.31 ± 1.64	0.042	2.47 ± 1.54	2.36 ± 1.66	0.070	2.30 ± 1.59	2.20 ± 1.60	0.354

Data expressed as mean ± standard deviation. Abbreviations: Ab: abduction; FPI: Foot posture index; TNJ: Talonavicular joint.