Time trends (1995–2008) in dietary habits among adolescents in relation to the Norwegian school fruit scheme: the HUNT study

Table 1 Characteristics of study population within Young-HUNT1; control schools and intervention schools, Young-HUNT1 and Young-HUNT3 and within Young-HUNT3; intervention group and control group

	Young-HUNT1***			Young-HUNT1 vs Young-HUNT3			Young-HUNT 3*
	Control schools (n = 2346)	Intervention schools (n = 1791)	p-value	Young-HUNT1 (N = 4137)	Young-HUNT3 (N = 4113)	p-value	Control group (N = 2855)	Intervention group (N = 1892)	p-value
Age (mean)	14.6	14.7	0.029	14.6	14.5	< 0.001	14.7	14.5	< 0.001
Age (mean)	%	%	0.029	%	%	< 0.001	%	%	< 0.001
Sex (female)	50	52	0.175	51	50	0.524	49	50	0.740
Educational intentions (higher)	14	16	0.012	15	34	< 0.001	34	35	0.680
Municipality urbanity (urban)	58	62	0.006	60	63	0.013	70	63	< 0.001
Grade junior high			0.399			0.005			0.026
8 th grade	32	31		32	34		33	36
9 th grade	34	33		34	34		34	33
10 th grade	34	36		35	32		33	30
Dietary consumption (daily)
Fruit	50	51	0.504	50	61	< 0.001	57	67	< 0.001
Vegetables	40	43	0.080	41	52	< 0.001	51	53	0.088
Potato chips	4	4	0.649	4	6	< 0.001	7	6	0.353
Candy	12	13	0.502	13	12	0.555	13	12	0.517
Sugar-sweetened beverages	16	19	0.012	17	29	< 0.001	29	28	0.469
Artificially sweetened beverages**	n.a	n.a	n.a	n.a	19	n.a	19	19	0.806

*In Young-HUNT3, participants who answered the questionnaire before the 1. Of September 2007 was defined as the control group and participants who answered after 1. September 2007 as the intervention group
N.a (not applicable). **Consumption of artificially sweetened beverages was not measured in the Young-HUNT1 survey
***Young-HUNT1 control schools and intervention schools grouping was based on schools by intervention and control in Young-HUNT3

ISSN: 1475-2891