Socioeconomic disparities in diet and physical activity in children: evidence from well-child visit electronic health records in the Canary Islands, Spain.

Background: Diet and physical activity (PA) in childhood are heavily influenced by the living environment. While diet quality follows a socioeconomic pattern, limited evidence is available in relation to PA in children. We assessed the effect of socioeconomic status at the individual (SES) and neighbourhood (NSES) levels on diet and PA among children from the general population of the Canary Islands, Spain.

Methods: In this cross-sectional study, patients aged 6-14 years from the Canary Health Service in 2018 were included (n=89 953). Diet and PA surveys from the electronic health records of the well-child visit programme were used. A healthy habits (HH) score was defined to assess the level of adherence to the dietary and leisure time PA guidelines. We modelled the association between the HH score, SES and NSES using a stepwise multilevel linear regression analysis, differentiating between specific and general contextual observational effects.

Results: A strong positive association between SES and the HH score was found, as children living in more affluent families were more likely to follow a healthy diet and being physically active. Differences in the HH score between geographical areas were of minor relevance (variance partition coefficient=1.8%) and the general contextual effects were not substantially mediated by NSES (proportional change in variance=3.5%). However, the HH score was significantly lower in children from areas with a higher percentage of annual incomes below the €18 000 threshold.

Conclusion: HH followed a socioeconomic gradient at the individual and the neighbourhood level. In the study population, the geographical component of the inequalities found were low.