Normal spirometry values in Saudi nationals in the Western Region of Saudi Arabia

The spirometric normal values of Saudi males [n = 222] and females [n = 172] were measured. FEV, and FVC values of males and females were lower than those of North Americans and Europeans but higher than those of North Indians. Males had higher values than females of the same age group with FEV, and FVC values decreased progressively with age. FEV[1]/H[3] ratios, which correlate with small airway function, were greater in males than in females and decreased with advancing age. Regression equations incorporating sex, age and height were derived for the population studied to be used in the prediction of the pulmonary function values of Saudis in the Western region