Table 2.

Intraclass correlation coefficient (ICC) and mean difference compared to the gold standard number of steps as counted by the researchers.

Sensor location and patient characteristic	ICC of number of steps (95% CI)	Mean difference, % (95% CI)	P (Student's t test or ANOVAa)
Hips—overall	.326 (-.214 to .684)	-81.4 (-93.2 to -69.5)	<.001 b
Ankles—overall	.837 (.630 to .927)	-26.1 (-43.9 to -8.2)	.006
Ankles—without walker	.791 (.304 to .937)	-5.6 (-27.0 to +15.8)	.58
Ankles—with walker	.815 (.193 to .947)	-45.1 (-71.5 to -18.5)	.003
Ankles—with walker, with correction factor of +50%	.773 (.292 to .927)	-17.6 (-57.4 to +22.2)	.57
Ankles—step length >0.232 m	.973 (.902 to .993)	+3.5 (-13.5 to +20.6)	.65
Ankles—step length <0.232 m	.792 (.288 to .932)	-46.4 (-70.4 to -22.4)	.001
Ankles—step length <0.232 m, with correction factor of +50%	.734 (.238 to .907)	-19.6 (-55.5 to +16.3)	.29
Ankles—FACc=3	.816 (.377 to .945)	+0.78 (-20.9 to +22.5)	.94
Ankles—FAC=0,1,2	.801 (-.080 to .949)	-51.0 (-73.3 to -28.7)	<.001
Ankles—FAC=0,1,2, with correction factor of +50%	.803 (.387 to .937)	-26.5 (-59.9 to +7.02)	.15

^aAnalysis of variance (ANOVA).

^bValues in italics are statistically significant.

^cFunctional Ambulation Category (FAC).