examined. Part of the results is shown in Table-1 . Table-l: Rate of broken appointments, by distance which patients live from clinic, for women aged 45-49 Miles from Clinic % Broken Appointments These differences were statistically signicant. It was suspected, however, that the social class composition of the patients living in different distances from the clinic varied, which may have affected the number of broken appointments. Accordingly, to control for social class, each patient was given a social class score, and a social class adjusted rate of broken appointments was computed as shown in Table-2 . The adjusted rates were not significantly different from each other