Anthropometrics: Height and Weight Overview Applications Systems Used For Patients Height and Weight are two of the most basic anthropometric measurements used in nearly every clinical research study. Height: • Performed using a wall-­‐mounted standiometer. • Equipment: Harpenden Stadiometer by Seritex. • Each participant is measured 3 times to ensure accuracy and account for posture changes. All measurements must be within 0.5 centimeters of each other. An average is used for the participant’s height. • If someone is unable to stand, a knee measurement and algorithm is used. • Equipment: Ross knee height calipers. Anthropometrics: Weight Weights: Weights are performed using an electronic scale. Equipment: Tanita Scale BWB-­‐800 A wheelchair scale is available for anyone unable to stand on their own. Equipment: Scale-­‐tronix • One weight is performed and used. • Weights can either be “metabolic” in which the participant wears a known standardized gown and pants with weights, the weight of the gown and pants are subtracted from the participant’s weight to get the most accurate weight. • Alternatively subjects can be weighed in light street clothes with shoes and any other heavy items removed. • Subjects may be weighed facing the scale or backwards (blinded) depending on the needs of the protocol. Metabolic C alculations Various metabolic calculations can be derived from measurements of weight, height and several other factors • Body Mass Index (BMI) is calculated as weight (kilograms)/ height (meters)2 • Ideal body weight (IBW) can be calculated in several ways. Below outlines the CRC’s standard procedures for adults and pediatrics. • IBW in adults: Frame size is calculated by measuring elbow breadth. Based on age and race, the individual is then categorized as small, medium or large framed and an ideal body weight is determined based on the Metropolitan Life Insurance Company tables from 1983 • Equipment: Elbow Caliper Bicondylar Vernier Caliper by Holtain • Percent Ideal Body Weight (% IBW) is calculated by dividing the subjects current weight with their IBW per the growth charts. • IBW In pediatrics (<18 years old, or <20 years old depending on study preference) IBW is performed using CDC growth charts • The subject’s age (in years and months) is plotted on the appropriate growth chart for males or females for BMI for age percentiles. The BMI for 50% of that age is then multiplied by the subjects current height to determine their ideal body weight. • Percent Ideal Body Weight (% IBW) is calculated by dividing the subjects current weight with their IBW per the growth charts. What the participant can expect: • Depending on the study, participants may be asked to change into a johnnie and pants for a metabolic weight. • All participants will be asked to remove their shoes, whenever possible. • Accommodations will be made to best assist a participant in getting their height and weight such as using the knee calipers or wheel chair scale for those who cannot stand. Safety bars are also available for those who can step up to the scale or stadiometer. • Participants may be asked to step on the scale backwards and may not be able to be told their weight and/ or height for the sake of blinding in a study. Please talk with your study coordinator for any questions or concerns. • A measurement of the participants elbow may be taken by having a caliper placed on either side of their right elbow.