Table 2.

Instantaneous average power in the LB (<1.5 Hz) and HB (>1.5 Hz)

Power	Controls	AD nonfallers	AD fallers	Intergroup p value			Intragroup p value
				C vs. AD fallers	C vs. AD nonfallers	AD fallers vs. AD nonfallers	C	AD fallers	AD nonfallers
−4 to 0 s							−4 to 0 vs. 0–4 s
LB, μ	49,269±153,186	75,092±54,267	107,734±213,439	0.021	0.156	0.552	0.992	0.638	0.426
HB, μ	38,452±227,522	90,412±102,705	137,576±113,418	0.001	0.037	0.131	0.002	0.067	0.074
0–4S							0–4 vs. 4–8 s
LB, μ	53,887±55,417	93,178±100,454	86,086±561,911	0.018	0.188	0.456	0.352	0.067	0.426
HB, μ	87,021±170,807	141,058±112,508	200,029±1996,252	0.012	0.117	0.331	0.01	0.005	0.020
4–8 s							−4 to 0 vs. 4–8 s
LB, μ	58,180±40,505	74,877±96,107	123,381±396,144	0.008	0.383	0.261	0.953	0.557	1.000
HB, μ	102,373±371,794	125,411±191,455	286,321±659,403	0.011	0.156	0.175	0.490	0.206	0.496

Data are presented as medians ± standard deviation unless specified otherwise. Significant p values are in italics. Descriptive table of instantaneous average power (median + 1 standard deviation) in the LB (<1.5 Hz) and HB (>1.5 Hz) on the z-axis during different time intervals: 4 s before environment change (−4 to 0 s), immediately after visual perturbation till 4 s later (0–4 s), and from 4 s till 8 s later (4–8 s). Pairwise post hoc analysis of intergroup comparison [controls (C), AD fallers, and AD nonfallers] and Wilcoxon paired t test analysis of intragroup comparison.