Aging is a natural degenerative process in life. Most of the functional capacities show a decrement, as compared to the norms which in turn should be age-matching. If they match age they are from foreign countries with wide variations in living conditions therein. Hence, reduced function should not be mistaken as a disease, right away. Further another pitfall is in considering a lesser specific parameter, for comparisons. For example, for lung volumetric measurements height is more specific over Body Mass Index but some hold a notion that as if, BMI is more scientific! For obesity BMI is specific but corroborative evidence from body tissue composition is also valid. Skin caliper measurements of fat thickness are equally reliable as compared to bio-physical measurements of tissue impedance.   

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