Maximal Respiratory Pressure Reference Values for Hopi Children Ages 4-13.

The values apply only to Hopi children, not to all Native American children. The paper notes that Hopi and Navajo pulmonary function results differ from each other. Children had to have pure Hopi descent on both parents' and grandparents' lines, so the equations may not apply to Hopi children with mixed ancestry. The MEP test did not use the larger rubber mouthpiece pressed against the lips and teeth recommended by Black and Hyatt, so MEP values may be lower than in studies using that technique. Chest size was not measured, so pressure differences between groups may partly reflect thoracic cage size rather than respiratory muscle force. The supplied text refers to tables for the actual equations, coefficients, and pressure values, so those numbers cannot be checked or used from this summary alone. The paper reports reference values and prediction differences, not patient outcomes, so it does not show that using the equations changes diagnosis or treatment.

Do not conclude that Hopi children have weaker respiratory muscles because their measured pressures differ from other equations. The study compares prediction equations in a healthy reference sample and does not report disease or treatment outcomes.