Table 3.

Frequency analysis cross-tabulated by age and vibration axis.

	A-P direction			S-I direction
	fp	fc	BW	fp	fc	BW
Age < 35	0.54 ± 0.21	3.22 ± 1.89	10.4 ± 5.54	0.49 ± 0.12	6.47 ± 3.75	14.9 ± 6.90
35 ≤ Age < 45	0.47 ± 0.10	9.56 ± 14.3	32.6 ± 42.16	0.53 ± 0.12	4.06 ± 2.48	17.1 ± 17.1
45 ≤ Age < 55	0.49 ± 0.05	9.09 ± 12.5	26.2 ± 25.6	0.60 ± 0.17	10.6 ± 10.4	34.9 ± 35.1
Age ≥ 55	0.68 ± 0.28	3.46 ± 2.13	35.9 ± 38.5	0.64 ± 0.16	10.5 ± 9.90	45.4 ± 58.2