Source of Support: None, Conflict of Interest: None
Forced Vital Capacity (FVC), Forced Expiratory Volumes in 0.75 and 1.0 seconds, (FEV0.75 and FEV1) and Forced Expiratory Flow Rate over the middle half of FVC (FEF25-75%) were determined with a McKesson Vitalor. American school boys between 8 and 11 years of age were taller and heavier and had higher function values than Indian school boys of the corresponding age. Indian school boys of approximately similar physical build had spirometric values similar to the American boys but were about two years older by the time they attained the same stature and function values. It appears that a part of the ethnic spirometric variations are due to anthropologic ethnic differences.