Peak Expiratory Flow Rate (PEFR) was measured with a Wright Peak Flow Meter in 851 healthy men and women of two categories; Group I--students and staff of the Medical College constituting the middle income group, and Group II--healthy individuals from the poorer class with an income of less than Rs.200/-per month, forming the lower income group. In both categories women had much lower values than men, and in both sexes the values in the subjects of the poor income group was significantly lower. The PEFR was found to correlate best with height in subjects below 30 years, and with age in older subjects. The mean values, standard deviations and regression equations are given for the different groups. Present values are also compared with some western and Indian data.