TABLE 4.

Mean (and SD) pre/post values and Cohen’s d of the pre–post growth in each condition for writing competence, writing self-efficacy, and self-regulated motivations.

	Teacher feedback			Trained peer feedback
	Pre	Post	Pre–post d	Pre	Post	Pre–post d
Writing competence	12.1 (1.1)	12.8 (1.2)	0.58**	12.6 (1.2)	13.0 (1.1)	0.39*
Writing self-efficacy
General	66% (11%)	73% (9%)	0.72**	74% (13%)	82% (8%)	0.70**
Skill	72% (10%)	77% (10%)	0.49**	78% (13%)	81% (10%)	0.25*
Task	64% (12%)	72% (10%)	0.74**	73% (12%)	78% (9%)	0.44**
Feedback	62% (13%)	70% (12%)	0.63**	72% (15%)	85% (6%)	1.08**
Motivation
Autonomous	29.4 (3.6)	29.7 (3.3)	0.08	29.3 (3.6)	31.8 (2.1)	0.85**
Controlled	31.8 (6.7)	32.1 (6.7)	0.04	30.6 (6.8)	33.4 (6.9)	0.41

**p < 0.01, *p < 0.05.