Use of a Weight Loss Index for Evaluating Weight Management in Adults

Abstract Objective A quantitative method for evaluating weight loss using the body mass index (BMI) standard 25, during part or the entire weight loss continuum, was designed and tested. Design Weight Loss Index (WLI) represents the area under the curve of the graphical representation of the weight loss attempt; x-axis=time, y-axis=BMI, BMI standard=25.0. Setting Reliability of the WLI for 1-5 years of weight loss efforts in 50 overweight (BMI=39.1±7.6) patients was evaluated by comparing their calculated WLI to a weight loss ratio, derived using a traditional 2-point comparison. Weight Loss Index sensitivity was tested by sending weight loss scenarios to obesity experts, who were asked to rank success of each weight loss attempt within a scenario. Expert rankings were compared to WLI rankings. Variables Measured Age, weight, height, BMI, WLI. Analysis Dependent t-test for WLI versus pre-post BMI values. Spearman’s correlation coefficients for WLI versus expert rankings. Significance, P