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Fig. 1 | BMC Health Services Research

Fig. 1

From: Impact of weight trajectory after bariatric surgery on co-morbidity evolution and burden

Fig. 1

Scheme for analysis of outcome and cost impact by weight trajectory. The above schematic depicts the sequence of calculations performed separately for each of 6 weight loss trajectory groups as defined in the study of Courcoulas et al. Percent total weight loss (%TWL) is modelled as a function of time over the 10-year time horizon post-RYGB. From the patient cohort demographics, the modelled TWL is converted to body mass index (BMI) for each post-surgical year in the two trajectories and time after surgery converted to age. The yearly BMI is used to calculate the incidence of new co-morbidity cases in patients without the co-morbidity at baseline, while the yearly BMI and patient age are used to calculate the resolution in patients who had the co-morbidity at baseline. Together, these are used to calculate the annual prevalence. Summing over the time horizon, the impact on cases to be treated is taken as the difference between cases in the poor trajectory minus those in the good trajectory. This difference is multiplied by annual co-morbidity treatment costs to determine the impact on costs

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