Table 2.

Acceleration data for the three axis during the six steps trials.

			Device
Mean Acceleration	No of Steps	Trials	Smartphone 1 (Mean ± SD)	Smartphone 2 (Mean ± SD)	Smartphone 3 (Mean ± SD)	Vicon System (Mean ± SD)
X axis	1	9	−0.0497 ± 0.0050	−0.0492 ± 0.0048	−0.0487 ± 0.0041	−0.0495 ± 0.0042
	2		−0.0512 ± 0.0016	−0.0487 ± 0.0035	−0.0466 ± 0.0037	−0.0468 ± 0.0043
	3		−0.0484 ± 0.0035	−0.0506 ± 0.0037	−0.0476 ± 0.0046	−0.0496 ± 0.0029
	4		−0.0486 ± 0.0040	−0.0493 ± 0.0037	−0.0496 ± 0.0050	−0.0495 ± 0.0030
	5		−0.0488 ± 0.0047	−0.0486 ± 0.0036	−0.0507 ± 0.0038	−0.0493 ± 0.0049
	6		−0.0495 ± 0.0033	−0.0499 ± 0.0043	−0.0518 ± 0.0020	−0.0490 ± 0.0053
	Total	54	−0.0494 ± 0.0038	−0.0494 ± 0.0038	−0.0492 ± 0.0042	−0.0489 ± 0.0041
Y axis	1	9	−0.0237 ± 0.0083	−0.0286 ± 0.0091	−0.0279 ± 0.0099	−0.0287 ± 0.0060
	2		−0.0287 ± 0.0088	−0.0314 ± 0.0074	−0.0305 ± 0.0080	−0.0241 ± 0.0072
	3		−0.0274 ± 0.0076	−0.0309 ± 0.0089	−0.0279 ± 0.0064	−0.0226 ± 0.0072
	4		−0.0282 ± 0.0110	−0.0269 ± 0.0073	−0.0292 ± 0.0069	−0.0220 ± 0.0077
	5		−0.0294 ± 0.0070	−0.0246 ± 0.0062	−0.0272 ± 0.0079	−0.0291 ± 0.0083
	6		−0.0270 ± 0.0090	−0.0269 ± 0.0094	−0.0231 ± 0.0066	−0.0236 ± 0.0051
	Total	54	−0.0274 ± 0.0085	−0.0282 ± 0.0081	−0.0276 ± 0.0077	−0.0250 ± 0.0073
Z axis	1	9	−0.0053 ± 0.0259	−0.0031 ± 0.0245	0.0176 ± 0.0274	0.0074 ± 0.0311
	2		0.0017 ± 0.0351	0.0088 ± 0.0291	0.0186 ± 0.0199	0.0176 ± 0.0166
	3		0.0066 ± 0.0249	0.0155 ± 0.0309	−0.0014 ± 0.0197	−0.0054 ± 0.0312
	4		0.0073 ± 0.0268	0.0287 ± 0.0203	0.0051 ± 0.0299	0.0165 ± 0.0309
	5		0.0070 ± 0.0270	0.0067 ± 0.0246	−0.0113 ± 0.0115	0.0124 ± 0.0240
	6		0.0164 ± 0.0283	−0.0015 ± 0.0251	−0.0005 ± 0.0253	0.0068 ± 0.0281
	Total	54	0.0056 ± 0.0276	0.0092 ± 0.0270	0.0047 ± 0.0245	0.0092 ± 0.0273