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The interpretation of lung function tests must be based on reference normal values obtained in the same population. In Chile an expert panel recommended the use of values obtained by, Gutierrez el al locally, that are higher than those obtained by Knudson, for forced vital capacity (FVC) and forced expiratory volume in the first second (FEV1).

Aplicación clínica de los valores de referencia de espirometría realizados en niños chilenos