Abstract
Nutritional assessment of elderly people is limited due to a lack of age-corrected standards. The objective of this study was to develop a new, more age-independent index for nutritional assessment by correcting the creatinine height index (CHI) for the age-induced changes in its variables. This might improve the differentiation between physiological reduction in muscle mass in elderly people and the changes induced by malnutrition. Seventy-four elderly and 100 young healthy volunteers were compared by anthropometric and biochemical-assessment variables. From the high correlation between total arm length and body length (r = 0.86; P less than 0.001) and the use of an alternative formula to calculate ideal body weight (IBW) from height and wrist circumference, a relatively age-independent estimate of IBW was determined. Creatinine arm index, as an adapted index of CHI, is proposed based on this age-independent IBW estimation and a specific creatinine coefficient for different age groups.
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