Table 3.

Within-group differences in grey intensity values (n = 60)

	Baseline		T1		P-valuea
	Mean	SD	Mean	SD
Group 1 (n = 15)	145.45	14.95	128.63	13.67	< 0.001
Group 2 (n = 15)	145.27	18.29	134.82	15.98	< 0.001
Group 3 (n = 15)	136.22	15.24	123.75	11.77	< 0.001
Group 4 (n = 15)	139.9	9.61	133.43	9.18	0.001

^aStatistically significant at level P < 0.05, Paired t-test.

SD = standard deviation.