Table 4.

Pre-post participant differences grouped by group membership (Student’s T test for paired samples).

Groups		Pre	Post	T	df	p	d
Low (N = 8)				−7.933	7	<0.001	1.89
	M	10.88	21.13
	SD	3.80	1.55
	SE	1.34	0.55d
Medium (N = 13)				−2.747	12	0.018	0.76
	M	19.46	22.00
	SD	2.26	3.79
	SE	0.63	1.05
High (N = 9)				0.336	8	0.746	0.11
	M	25.33	25.11
	SD	1.00	1.76
	SE	0.33	0.59

M = mean; SD = standard deviation; SE = standard error; t = Student’s T test; df = degrees of freedom; p = probability; d = Cohen’s d.