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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

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

 Young-HUNT1***Young-HUNT1 vs Young-HUNT3Young-HUNT 3*
Control schools
(n = 2346)
Intervention schools
(n = 1791)
p-valueYoung-HUNT1 (N = 4137)Young-HUNT3 (N = 4113)p-valueControl group (N = 2855)Intervention group (N = 1892)p-value
Age (mean)14.614.70.02914.614.5< 0.00114.714.5< 0.001
%%%%%%
Sex (female)50520.17551500.52449500.740
Educational intentions (higher)14160.0121534< 0.00134350.680
Municipality urbanity (urban)58620.00660630.0137063< 0.001
Grade junior high0.399  0.005  0.026
8 th grade323132343336
9 th grade343334343433
10 th grade343635323330
Dietary consumption (daily)
Fruit50510.5045061< 0.0015767< 0.001
Vegetables40430.0804152< 0.00151530.088
Potato chips440.64946< 0.001760.353
Candy12130.50213120.55513120.517
Sugar-sweetened beverages16190.0121729< 0.00129280.469
Artificially sweetened beverages**n.an.an.an.a19n.a19190.806
  1. *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
  2. N.a (not applicable). **Consumption of artificially sweetened beverages was not measured in the Young-HUNT1 survey
  3. ***Young-HUNT1 control schools and intervention schools grouping was based on schools by intervention and control in Young-HUNT3