Objectives: The objectives of this study were to: evaluate the effectiveness of school-based health promotion interventions through: - a systematic review of primary studies of the effectiveness of the health promoting schools approach - a systematic review of existing reviews of the effectiveness of other health promoting interventions in schools in the following areas: nutrition, exercise, safety, psychological aspects of health, sexual health, substance use, personal hygiene, environmental issues and family life education indicate areas where further research is needed make recommendations for practice in the UK, if research findings permit. Methods: Study selection To be included in the review of the effectiveness of the health promoting schools approach, studies had to: be controlled studies or before-and-after studies evaluating school-based interventions involving health promoting activity in each of three areas: (i) the school ethos and/or environment, (ii) the curriculum, and (iii) the family and/or community; and demonstrate active participation by the school provide information about the components and delivery of the intervention report all evaluated outcomes. To be included in the review of existing reviews of health promotion in schools, reviews of effectiveness of health promotion interventions in schools had to: provide evidence of a systematic search assess the quality of the research include some studies with a comparison group or some before-and-after studies report study details such as number of participants, give some details of the content of the interventions evaluated and include primary preventive interventions using a population approach. Data sources: The following electronic databases were searched: ASSIA, BIDS, British Education Index, CINAHL, DHSS Data, Dissertation Abstracts, EMBASE, ERIC, MEDLINE, PsycINFO, PsycLIT, SIGLE, Sociofile. Reference lists were checked to identify other relevant studies, relevant web pages were scanned, and requests for unpublished data were made to people working in the field. Data extraction: Data were extracted by one reviewer, using a pro forma, and checked by a second reviewer. The methodological quality of both primary studies and reviews were assessed and commented upon. Data synthesis: A quantitative synthesis was judged impractical due to the multiplicity of outcomes and incomplete reporting of all the components of the interventions. A qualitative synthesis is presented. Results: Review of primary studies of the health promoting schools approach The search identified 1067 titles and abstracts relevant to health promoting schools. Of these, 111 appeared to be either useful background material or evaluations of interventions and were obtained. Twelve studies met the inclusion criteria. Available evidence of effectiveness Few studies were available for this review, and only two of these were adequately powered randomised controlled trials. None of the schools involved in the studies had implemented all the components of the health promoting schools approach. The evidence available to support the health promoting schools approach was limited but promising. The approach can be shown to impact on the social and physical environment of the school in terms of staff development, school lunch provision, exercise programmes and social atmosphere. Although failing to demonstrate effectiveness in all studies, the approach was successful in some in improving aspects of health- related behaviour such as dietary intake and aspects of health such as fitness. There is some evidence that this approach is able to impact positively on aspects of mental and social well-being such as self-esteem and bullying, which have previously proved difficult to influence. Costs: Insufficient information was given to be able to comment on relative costs, but in the UK study of health promoting schools a small financial investment in schools was considered important for success. Theoretical bases of effective interventions: Although the interventions tested in these studies clearly drew implicitly on a number of health promotion theories, the theory base was explicitly stated for only two interventions. Review of reviews of health promotion in schools: Over 200 reviews of the effectiveness of school health promotion were identified. Of these, 32 met the inclusion criteria. Available evidence of effectiveness: Systematic reviews of effectiveness are available in the following areas: nutrition and exercise, safety, psychological aspects of health, sexual health, substance use and personal hygiene. Most of the studies included in the reviews originated from outside the UK; mostly from North America. Reviews varied in their methodological quality. Almost all the interventions, for which this outcome was reported, demonstrated improved health knowledge, which is an important prerequisite for future health. The impact of interventions on attitudes, health-related behaviour and health was much less reliable. Some effective or partially effective interventions have been identified in most areas, but many were ineffective, and a few were shown to have adverse effects. Interventions to promote healthy eating and fitness, prevent injuries and abuse, and promote mental health were the most likely to be effective and those to prevent substance misuse, promote safe sex and oral hygiene the least effective. Effectiveness of different approaches: Most interventions have used classroom (curriculum) approaches only. Some interventions combined a classroom approach with changes to the school ethos and environment or with family and community involvement. Although the environmental approaches varied in the different areas of health need, interventions which included these approaches were more likely to be effective that those which did not. Interventions involving families varied in intensity and approach and in many reviews were inadequately described, but overall interventions incorporating this approach were more likely to be successful than those that did not. Effective components of classroom approaches: Assessment of the effectiveness of different components was limited by inadequate reporting of intervention content. Against a background of relative ineffectiveness there is evidence that substance use programmes incorporating normative education and resistance skills were more likely to be effective than those which did not. Programmes involving peers were most common in substance misuse reviews. They varied in approach and intensity, and in some studies were inadequately described. Substance misuse interventions incorporating this approach were, however, more likely to be effective than those which did not. There was evidence that stress management and life skills training had a positive impact in interventions addressing psychological aspects of health. Theoretical bases of effective interventions: Reviews often failed to report explicitly the theoretical basis of interventions. From the very limited evidence available there are indications that programmes based on social learning theory and social influences are the most effective. Conclusions: The health promoting schools approach: The health promoting schools initiative is a new, complex, developing initiative, and the optimum method of evaluation is currently under debate. There are indications that this approach is promising. The development of programmes to promote mental and social well-being would be likely to improve overall effectiveness and the impact of staff health and well-being needs more consideration. The development of measures of mental and social well-being is important for future evaluation. Continued investment, and ongoing evaluation are necessary to provide evidence about the effectiveness of this approach. Health promotion in schools: This review of reviews has shown that school health promotion initiatives can have a positive impact on children's health and behaviour but do not do so consistently. It would appear that most interventions are able to increase children's knowledge but that changing other factors which influence health, such as attitudes and behaviour, is much harder to achieve, even in the short-term. Overall, a multifaceted approach is likely to be most effective, combining a classroom programme with changes to the school ethos and/or environment and/or with family/community involvement. This is consistent with the health promoting schools approach.