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Data about the demand for primary health care, collected in a group practice of more than 10,000 individuals, were analyzed by Probit and Tobit techniques. With respect to the number of GP-contacts the results indicate, besides the well-known impact of age, sex, social class and morbidity, serious Interdoctor Variation, important influence of Problem Behavior and significant differences due to the Insurance System.
Gaag et al. (Sat,) studied this question.