Table 3

Descriptive statistics of the study variables for the intervention and control schools in pre-and post-test: Within- and between-school differences and interaction effects.

Groups study variables	Test time	Control school	Intervention school	Contrast within-school differences (pre-and post-test)
Groups study variables	Test time	M ± DE	M ± DE	Dif. media	DE	F	p	η_p²
Motivational regulations: Wilks’ Lambda = 0.866; F (6, 75) = 1.935; p = .086; η_p² = .134
Intrinsic motivation (range: 1–5)	Pre	2.82 ± 0.21^a	3.06 ± 0.20^a	–0.24	0.29	0.707	.403	.009
Intrinsic motivation (range: 1–5)	Post	2.47 ± 0.18^a	3.85 ± 0.18^b	–1.38	0.25	29.57	*<.001*	.270
Integrated regulation (range: 1–5)	Pre	2.69 ± 0.23^a	2.53 ± 0.22^a	0.16	0.32	0.243	.624	.003
Integrated regulation (range: 1–5)	Post	2.26 ± 0.21^a	3.36 ± 0.20^b	–1.10	0.30	13.550	*<.001*	.145
Identified regulation (range: 1–5)	Pre	2.82 ± 0.22^a	3.36 ± 0.22^a	–0.55	0.31	3.058	.084	.037
Identified regulation (range: 1–5)	Post	2.47 ± 0.20^a	4.00 ± 0.20^b	–1.53	0.28	29.931	*<.001*	.272
Introjected regulation (range: 1–5)	Pre	2.13 ± 0.20^a	2.02 ± 0.20^a	0.10	0.29	0.131	.718	.002
Introjected regulation (range: 1–5)	Post	2.08 ± 0.21^a	2.54 ± 0.21^a	–0.45	0.29	2.359	.128	.029
External regulation (range: 1–5)	Pre	2.24 ± 0.21^a	2.17 ± 0.21^a	0.07	0.29	0.058	.810	.001
External regulation (range: 1–5)	Post	2.08 ± 0.20^a	2.26 ± 0.19^a	–0.18	0.27	0.398	.530	.005
Amotivation (range: 1–5)	Pre	1.14 ± 0.19^a	0.83 ± 0.19^a	0.62	0.27	5.184	*<.01*	.061
Amotivation (range: 1–5)	Post	1.67 ± 0.17^a	0.59 ± 0.16^a	1.08	0.24	21.156	*<.001*	.209
Note. SD = Standard deviation; Diff. = Difference; CI = Confidence interval. The values with significant differences are presented in bold. Interaction effects are detailed next to each variable. The comparison between schools for each variable is indicated with different superscripts (^ano differences, ^bdifferences) in pre-and post-test. A mean is significantly different from another mean if they have different superscripts.

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