[Social determinants of overweight and obesity in Spain in 2006].

BACKGROUND AND OBJECTIVE

Obesity in the Spanish adult population has almost doubled from 1987 to 2003. The aim is to update the prevalence of overweight and obesity, and reassess its main social determinants using the National Health Household Survey (ENS) from 2006.

PATIENTS AND METHODS

Cross sectional study based on the ENS-2006. Sample of 29,478 adults who answered questions on self-reported weight and height. We calculated the body mass index (WHO classification) for the dependent variable. Sociodemographic independent variables used were age, sex, marriage status, educational level, social class (manual, non-manual), and monthly income. A descriptive study was conducted as well as different logistic regression models.

RESULTS

In 2006, the prevalence of overweight is higher in men (43.9%) than women (28.9%). Sex differences were not observed in the prevalence of obesity (15.0%). The multinomial logistic regression analysis shows significant associations between obesity and marriage status: married OR=1.69 (1.51-1.89), widower OR=1.77 (1.45-2.16); population without education: OR=2.77 (2.34-3.28) and income below 600 €: OR=1.50 (1.18-1.91). There was a statistically significant interaction (p<0.001) between sex and social class. Women from manual social class have 49% more chances to be overweight and 96% greater risk of obesity compared to non-manual social class women. In addition, men of manual social class have less risk of overweight (18%) and obesity (12%) than non-manual social class men.

CONCLUSIONS

Gender and socioeconomic status are key social determinants for obesity in Spain and, consequently, this needs to be addressed when developing preventive activities.