Journal
EUROPEAN JOURNAL OF PUBLIC HEALTH
Volume 22, Issue 3, Pages 373-377Publisher
OXFORD UNIV PRESS
DOI: 10.1093/eurpub/ckr040
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Funding
- European Community [FOOD-CT-2005-007034]
- Spanish Ministry of Health: Maternal, Child Health and Development Network [RD08/0072]
- Spanish Ministry of Education [EX-2008-0641, DEP2007-29933-E, AP2006-02464]
- Swedish Council for Working Life and Social Research
- ALPHA
- Fundacion Cuenca Villoro (Spain)
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Background: Although there is a growing interest in the epidemiology of sedentary behaviours, it is unknown whether sedentary behaviour questionnaires are broad markers of sedentary time. The aims of this study were to determine the: (i) reliability of the Healthy Lifestyle in Europe by Nutrition in Adolescence (HELENA) screen time-based sedentary behaviour questionnaire; and (ii) its validity, i.e. the ability of the questionnaire to correctly rank adolescents according to the objectively measured sedentary time. Methods: A total of 183 adolescents (104 females aged 12.5-17.5 years) were involved in the reliability study. Participants completed the HELENA sedentary questionnaire twice (1 week apart). The validity study comprised 2048 (1212 females) adolescents (12.5-17.5 years of age) included in the HELENA cross-sectional study. Questions included television viewing, computer games, console games, Internet for study and non-study reasons and study during week and weekend days. We compared median values of sedentary time, using accelerometers, by tertiles of self-reported sedentary behaviours and their sum (composite sedentary score). Results: Reliability study: kappa-values showed a good agreement (> 0.7), except for Internet for study reasons (0.46 weekdays, 0.33 weekend). The questionnaire correctly classified boys' sedentary time when analysed by specific behaviours and by a composite sedentary score. In girls, median values of objectively measured sedentary time were not different across tertiles of self-reported sedentary behaviours or the composite sedentary score. Conclusion: The HELENA sedentary questionnaire is reliable, yet only correctly classifies objectively measured sedentary time in boys.
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