Relative changes (means and 95% CIs) in fat intake (E%) based on a mixed model for surgically treated individuals, grouped according to baseline sex, age, education, smoking and physical activity, and treatment type. The model was adjusted for sex and baseline age (except when examined as the main predictor) and baseline fat intake. P-values for the interactions between subgroups and changes in fat intake over time were derived from ANOVA tables (F-statistics). E% denotes percentage of total energy intake; GB, gastric bypass; VBG, vertical banded gastroplasty.