Table 2.

Pretest and posttest scores of S-scales.

Groups	Pretest	Posttest	Difference
Non-BFa (control)	39	61	−22
Non-BF	64	28	36
Non-BF	38	67	−29
Non-BF	46	67	−21
Non-BF	33	47	−14
BF (experimental)	39	45	−6
BF	29	28	1
BF	42	65	−23
BF	39	37	2
BF	34	41	−7

^aBF: biofeedback.