Efficacy of a county-wide schools weight management intervention

This study aimed to evaluate the effectiveness of the Local Authority commissioned large-scale public health service that provided a 6-week school-based weight management intervention for children aged 4-19 years.

A quantitative retrospective cohort study identified participants from 130 schools consisting of 8550 potential children aged 4-19 years across a mixture of Lower Super Output Area (LSOA) deprivation groups. Participants were invited to take part in a 5- to 12-week Healthy Lifestyles intervention with a focus on weight management delivered by OneLife Suffolk between 1 January 2017 and 1 January 2020. This resulted in a final sample of 5163 participants. The following information for each child was collected anonymously: (1) age, (2) gender, (3) preprogramme body mass index (BMI), (4) postprogramme BMI, (5) weight category and (6) LSOA category.

Following the 6-week school-based intervention, there was a significant decrease in mean ΔBMI SDS (standardised body mass index) of -0.07 (-14.89%) among participants. Wilcoxon signed-rank test showed a significant change in weight status post 6-week weight management programme (WMP): BMI (Z = -15.87, p < .001), BMI SDS (Z = -21.54, p < .001), centile (Z = -20.12, p < .01) and weight category (Z = -7.89, p < .001), whereas Mann-Whitney U test showed no statistically significant difference in mean BMI SDS change between gender groups (p = .24) and Kruskal-Wallis test revealed no statistically significant differences in mean BMI SDS change between child LSOA groups (c²(4) = 1.67, p = .796), school LSOA groups (c²(4) = 4.72, p = .317), ethnic groups (c²(4) = 2.53, p = .640) and weight category at the start of the intervention (c²(3) = 6.20, p = .102).

This study contributes to the growing body of evidence demonstrating the efficacy of multicomponent school-based weight management interventions and demonstrates that such interventions can be successfully implemented as part of a wider healthy lifestyles service, without widening health inequalities.