Table 2.

Mean and standard deviation of 12 motion correction parameters, for the two subject groups. The mean and the standard deviation were quantified in terms of cumulative value (see the text) and the maximal value (see the text). Student t-test was used to test group difference in each of the 12 parameters. For each test, the degree of freedom was 44. All the p values were Bonferroni corrected (uncorrected p×12). D = derivative.

Motion parameter	Cumulative			Maximal
	CUD	Control	Statistics	CUD	Control	Statistics
x translation (mm)	51.1 ± 32.3	65.6 ± 51.8	t = −1.13; p = 1	0.44 ± 0.29	0.44 ± 0.25	t = 0.02; p =1
y translation (mm)	89.5 ± 58.1	62.8 ± 39.8	t = 1.82; p = 0.96	0.59 ± 0.66	0.32 ± 0.16	t = 1.90; p = 0.72
z translation (mm)	144.4 ± 123.0	108.3 ± 63.0	t = 1.26; p = 1	1.01 ± 0.98	0.74 ± 0.40	t = 1.23; p = 1
x rotation (degree)	155.9 ± 118.6	143.4 ± 119.8	t = 0.35; p = 1	1.41 ± 1.39	0.93 ± 0.66	t = 1.49; p = 1
y rotation (degree)	61.6 ± 38.9	65.3 ± 48.5	t = −0.28; p = 1	0.44 ± 0.25	0.40 ± 0.23	t = 0.54; p = 1
z rotation (degree)	61.8 ± 43.7	71.8 ± 69.3	t = −0.59; p = 1	0.43 ± 0.23	0.43 ± 0.29	t = −0.02; p = 1
D x translation	24.2 ± 14.0	26.1 ± 13.3	t = −0.48; p = 1	0.33 ± 0.29	0.25 ± 0.12	t = 1.25; p = 1
D y translation	5.0 ± 2.6	5.0 ± 1.4	t = −0.01; p = 1	0.26 ± 0.36	0.11 ± 0.07	t = 1.95; p = 0.72
D z translation	12.9 ± 6.4	11.9 ± 5.8	t = 0.52; p = 1	0.51 ± 0.59	0.29 ± 0.33	t = 1.55; p = 1
D x rotation	10.8 ± 4.8	10.2 ± 3.9	t = 0.42; p = 1	0.91 ± 1.25	0.36 ± 0.31	t = 2.04; p = 0.60
D y rotation	7.6 ± 2.5	7.7 ± 2.0	t = −0.17; p = 1	0.22 ± 0.20	0.13 ± 0.06	t = 2.24; p = 0.36
D z rotation	6.7 ± 2.7	6.9 ± 2.8	t = −0.18; p = 1	0.23 ± 0.24	0.14 ± 0.06	t = 1.86; p = 0.84