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Background: Increasing prevalence of childhood obesity and its related consequences emphasises the importance of developing and evaluating interventions aimed at prevention. The importance of process evaluation in health intervention research is increasingly recognised, assessing implementation and participant response, and how these may relate to intervention success or failure. A comprehensive process evaluation was designed and undertaken for the West Midlands ActiVe lifestyle and healthy Eating in School children (WAVES) study that tested the effectiveness of an obesity prevention programme for children aged 6-7 years, delivered in 24 UK schools. The four intervention components were: additional daily school-time physical activity (PA); cooking workshops for children and parents; Villa Vitality (VV), a 6-week healthy lifestyle promotion programme run by a local football club; and signposting to local PA opportunities.Methods: Data relating to six dimensions (Fidelity, Reach, Recruitment, Quality, Participant Responsiveness, Context) were collected via questionnaires, logbooks, direct observations, focus groups and interviews. Multiple data collection methods allowed for data triangulation and validation of methods, comparing research observations with teacher records. The 6-stage WAVES study model ((i) Data collection, (ii) Collation, (iii) Tabulation, (iv) Score allocation and discussion, (v) Consultation, (vi) Final score allocation) was developed to guide the collection, assimilation and analysis of process evaluation data. Two researchers independently allocated school scores on a 5-point Likert scale for each process evaluation dimension. Researchers then discussed school score allocations and reached a consensus. Schools were ranked by total score, and grouped to reflect low, medium or high intervention implementation.Results: The intervention was predominantly well-implemented and well-received by teachers, parents and children. The PA component was identified as the most challenging, VV the least. Median implementation score across schools was 56/75 (IQR, 51.0 - 60.8). Agreement between teacher logbooks and researcher observations was generally high, the main discrepancies occurred in session duration reporting where in some cases teachers' estimations tended to be higher than researchers'.Conclusions: The WAVES study model provides a rigorous and replicable approach to undertaking and analysing a multi-component process evaluation. Challenges to implementing school-based obesity prevention interventions have been identified which can be used to inform future trials.Trial Registration: ISRCTN97000586 . 19 May 2010. [ABSTRACT FROM AUTHOR]

Objective: To explore the contextual influences on childhood obesity in Tehran, Iran to inform future development of an obesity prevention intervention for Iranian primary school children. Study design: Qualitative study. Methods: Focus groups and interviews with parents and school staff were convened to explore their perceptions of the causes of childhood obesity. Eleven focus groups and three interviews were held with parents and school staff (88 participants in total) from three different socio-economic areas in Iran's capital city, Tehran. All the discussions were transcribed verbatim in Persian. An iterative thematic approach was used for data analysis. Results: Overall, the causes of childhood obesity were perceived to relate to macro-level policy influences, the school environment, sociocultural factors, and family and individual behavioural factors, acting in combination. A key emergent theme was the pervasive influence of Government policies on children's food intake and physical activity. Another key theme was the political and sociocultural context that does not support girls and women in Iran in having active lifestyles. Conclusion: The findings suggest that parents and school staff have sophisticated views on the possible causes of childhood overweight and obesity which encompassed behavioural, structural and social causes. A prominent emerging theme was the need for state level intervention and support for a healthy environment. Any local initiatives in Iran are unlikely to be successful without such support. What is known on this subject: Childhood obesity is growing in Iran and it is seen as one of the features of the nutrition transition in developing countries. Findings from cross-sectional studies suggest a range of lifestyle factors contribute to obesity in the Iranian population. What this study adds: This qualitative study explores the socioenvironmental changes contributing to childhood obesity in primary school-aged children in Iran. Findings have provided important contextual data on the perceived contributors to childhood obesity in Iran, such as macro-level policy influences on accessibility to healthy food and physical activity, competing priorities at school level, sociocultural influences on diet and physical activity and limited knowledge and skills of parents. This has laid the foundation for the development of appropriate childhood obesity prevention interventions. [ABSTRACT FROM AUTHOR]