Life style interventions and weight reduction, mean values and percentage attaching high values (%).

*number and proportion of respondents considering the interventions as (highly) relevant or/and in high need of evidence.N: number of overall respondents; n(%): number of respondents (proportion) considering the relevance/need as very high or extremely high.R: number of reviews (completed); P: number of protocols (planned reviews) in the Cochrane Library.