Aims In this study we evaluated indicators of the feasibility, reliability, and validity of the Child Health Questionnaire-Child Form (CHQ-CF). We compared the results in a subgroup of adolescents who completed the standard paper version of the CHQ-CF with the results in another subgroup of adolescents who completed an internet version, i.e., an online, web-based CHQ-CF questionnaire. Methods Under supervision at school, 1,071 adolescents were randomized to complete the CHQ-CF and items on chronic conditions by a paper questionnaire or by an internet administered questionnaire. Results The participation rate was 87%; age range 13-17 years. The internet administration resulted in fewer missing answers. All but one multi-item scale showed internal consistency reliability (Cronbach's a > 0.70). All scales clearly discriminated between adolescents with no, a few, or many self-reported chronic conditions. The paper administration resulted in statistically significant, higher scores on 4 of 10 CHQ-CF scales compared with the internet administration (P < 0.05), but Cohen's effect sizes d were £ 0.21. Mode of administration interacted significantly with age (P < 0.05) on four CHQ-CF scales, but Cohen's effect sizes for these differences were also £ 0.21. ConclusionThis study supports the feasibility, internal consistency reliability of the scales, and construct validity of the CHQ-CF administered by either a paper questionnaire or online questionnaire. Given Cohen's suggested guidelines for the interpretation of effect sizes, i.e., 0.20-0.50 indicates a small effect, differences in CHQ-CF scale scores between paper and internet administration can be considered as negligible or small.Keywords Health status measurement Á Health-related quality of life Á Adolescents Á Feasibility Á Reliability Á Validity Á Online questionnaire Á Internet questionnaire Á Web-based questionnaire Á Child Health Questionnaire Child Form 87 items (CHQ-CF87) Á Reference / norm scores

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This article describes the association of external and psychosocial factors on the stages of change for fruit and vegetable consumption, among 2,781 inhabitants, aged 18 to 65 years, in deprived neighborhoods (response rate 60%). To identify correlates of forward stage transition, an ordinal logistic regression model, the Threshold of Change Model (TCM), was used to analyze the data. The results indicate that men, those from Dutch origin, those with (rather) low health locus of control, those displaying risk behaviors, and those without knowledge of dietary guidelines were less likely to move from one stage to another and therefore were more likely to be in a lower stage-of-change category. The results make it possible to distinguish target groups, which should receive more attention in future health promotion campaigns, and to identify factors to be addressed in those programs.

Exercise may prevent or slow the age-related decline in immune response. Micronutrient enriched foods showed no effect. As infectious diseases can have debilitating or even fatal consequences for the elderly, prevention of the age-related decline in CIR could significantly improve their quality of life.