The internal validation of weight and weight change coding using weight measurement data within the UK primary care Electronic Health Record.

38 They showed that the higher the previous BMI measurement the higher the likelihood of repeat BMI measurement, that an increasing trend in BMI lowered the likelihood of repeat BMI measurement, and that the presence of comorbidity increased the likelihood of BMI measurement.

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Within each method, there was little variation in the mean weight loss across age groups, although there was a slight trend toward greater weight loss being observed in the oldest age groups: mean weight loss for the trend method ranged from −5.2% (−5.7% to −4.7%) to −5.8% (−6% to −5.6%) across age groups and from −6.3% (−6.5% to −6.1%) to −10.2% (−10.3% to −10.1%) using the historic mean.

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