Between 1963 and 1970 public programs were introduced to reduce inequalities in access to medical care. We examined differentials in surgical utilization among socioeconomic groups in 1970 as well as changes between 1963 and 1970. Multivariate analysis of National Health Interview Survey data indicated that large increases in surgical utilization occurred among disadvantaged groups: the aged, lower educated and nonwhites in urban areas. Some differential by race and residence remains, but is strongly related to income. Income had a large positive effect on surgical utilization, but this effect was less strong in 1970 than in 1963. Education had a negative effect on surgical utilization. Eleven surgical procedures were selected and scaled on indexes of "complexity," "urgency" and "necessity." These indexes do not vary among demographic groups that have significant differences in surgical utilization. However, lower-income groups utilized to a lesser extent procedures rated lowest on the necessity scale.
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