Table 4.

Univariate analyses for the Green Eating (GE) constructs DB Pros, DB Cons, SE School and SE Home in the GE Project, a web-based intervention to promote environmentally conscious eating behaviours in US university students aged 18–24 years

	Baseline		Post		Within	Between
	Mean	sd	Mean	sd	t	F	η 2
DB Pros
Experimental (n 179)	3·75	0·66	3·85	0·61	−2·16*	5·06*	0·01
Control (n 290)	3·71	0·68	3·68	0·74	0·91
DB Cons
Experimental (n 162)	2·97	0·69	3·05	0·75	−1·31	1·62	0·004
Control (n 267)	2·98	0·67	3·14	0·71	−4·12***
SE School
Experimental (n 178)	2·46	0·72	2·68	0·73	−4·28***	15·62***	0·03
Control (n 292)	2·37	0·76	2·35	0·74	0·63
SE Home
Experimental (n 184)	3·38	0·86	3·48	0·83	−1·82	2·92	0·006
Control (n 299)	3·39	0·91	3·38	0·94	0·29

Multivariate analyses: Wilks’ λ=0·96, F(3, 410df)=5·12, P<0·01, η ²=0·04.

The decisional balance constructs, DB Pros and DB Cons, consisted of positive aspects and barriers associated with GE, respectively, based on an anchored Likert scale ranging from 1 (=‘not at all important’) to 5 (=‘extremely important’). The higher the score for DB Pros the more positively associated GE and the higher the score for DB Cons the more barriers associated with GE. The self-efficacy constructs, SE School and SE Home, consisted of eight items assessing the confidence of the subject to maintain GE behaviours while in a school or home environment, respectively, based on an anchored Likert scale ranging from 1 (=‘not at all confident’) to 5 (=‘extremely confident’). The higher the score, the higher the confidence in that environment.

*P<0·05, **P<0·01, ***P<0·001.