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Table 1 Mean values, standard deviation (SD) for girls and boys separately and combined and Cronbach's alpha values.

From: Determinants of fruit and vegetable intake among 11-year-old schoolchildren in a country of traditionally low fruit and vegetable consumption

    Fruit Vegetables
Scale Items Range Girls Mean (SD) Boys Mean (SD) All Mean (SD) Cronbach's alpha Girls Mean (SD) Boys Mean (SD) All Mean (SD) Cronbach's alpha
Intake (FFQ)   8-point scale converted into times per day 1.00 (0.81) 0.84 (0.78) 0.91 (0.80) - 1.17 (1.16) 0.85 (0.95) 1.00 (1.06) -
Personal
Knowledge of recommendations 1 8-point scale recoded (0) less than twice a day (1) twice a day or more 0.56 (0.50) 0.50 (0.50) 0.53 (0.50) - 0.39 (0.49) 0.36 (0.48) 0.38 (0.48) -
Attitudes 2 5-point scale from (2) I fully agree to (-2) I fully disagree 1.25 (0.73) 1.05 (0.90) 1.15 (0.83) 0.69 0.94 (0.93) 0.79 (1.03) 0.86 (0.99) 0.80
Liking 2 5-point scale from (2) I fully agree to (-2) I fully disagree 1.59 (0.54) 1.34 (0.82) 1.46 (0.71) 0.71 1.06 (0.98) 0.85 (1.08) 0.95 (1.04) 0.83
Self-efficacy 2 5-point scale from (2) I fully agree to (-2) I fully disagree 1.30 (0.80) 1.09 (0.93) 1.19 (0.88) 0.44 1.12 (0.90) 0.85 (1.00) 0.97 (0.96) 0.80
Preferences 12 5 point scale from (2) like very much to (-2) dislike very much 1.27 (0.48) 1.13 (0.61) 1.19 (0.56) - 0.48 (0.71) 0.42 (0.80) 0.45 (0.75) -
Perceived barriers 4 5-point scale from (2) I fully agree to (-2) I fully disagree -1.64 (0.55) -1.37 (0.78) -1.50 (0.69) 0.73 -1.52 (0.68) -1.23 (0.91) -1.37 (0.82) 0.80
Perceived socio-environmental
Modelling 3 5-point scale from (2) I fully agree to (-2) I fully disagree 0.61 (0.71) 0.49 (0.71) 0.54 (0.71) 0.59 0.52 (0.72) 0.39 (0.73) 0.45 (0.73) 0.68
Active parental encouragement 2 5-point scale from (2) I fully agree to (-2) I fully disagree 0.65 (1.09) 0.53 (1.19) 0.58 (1.14) 0.80 0.36 (1.08) 0.26 (1.23) 0.30 (1.16) 0.87
Demand family rule 1 5 point scale (2) yes always to (-2) never 0.32 (1.14) 0.04 (1.24) 0.18 (1.20) - 0.08 (1.13) -0.09 (1.24) -0.01 (1.19) -
Allow family rule 1 5 point scale (2) yes always to (-2) never 1.71 (0.70) 1.62 (0.77) 1.66 (0.74) - 1.52 (0.78) 1.30 (1.01) 1.40 (0.91) -
Perceived physical-environmental
Availability at home 3 5 point scale (2) yes always to (-2) never 1.01 (0.62) 0.94 (0.68) 0.97 (0.65) 0.59 0.82 (0.72) 0.70 (0.84) 0.76 (0.78) 0.68
Availability at school 1 5 point scale (2) yes always to (-2) never -0.64 (1.52) -0.75 (1.50) -0.69 (1.51) - -1.02 (1.32) -1.11 (1.22) -1.06 (1.27) -
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