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In a study in which patients were allocated non-systematically to surgeries booked at 5, 7.5, and 10 minute intervals 623 consultations were taperecorded. In surgeries booked at longer intervals doctors used the extra time to take a fuller history from their patients. In surgeries booked at 10 minute intervals doctors spent more time explaining the patient's problem, explaining the proposed management, and in discussing prevention and health education, these increases not being evident in surgeries booked at 7.5 minute intervals.
Roland et al. (Sat,) studied this question.