What determines the percentages used in height and weight tables according to regulations?

The correct choice is based on the fact that the height and weight tables used by the Army are primarily determined by the height of the individual and age categories. The Army Regulation establishes specific standards to help assess whether a service member is within a healthy weight range relative to their height, which is crucial for maintaining military readiness and overall fitness.

Height is a direct physical measurement, and age is considered because weight standards can vary depending on an individual's developmental stage and physical maturity. This approach ensures that the metrics are not only fair but also practical, recognizing that younger individuals may have different body compositions compared to older service members.

By focusing on height and age, the Army can create standards that accommodate the physiological differences that occur as a person matures, which is essential for ensuring that all personnel meet the necessary health requirements for effective duty performance.