Acta chirurgica Scandinavica
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Clinical data from 259 patients with suspected acute appendicitis were prospectively collected and used in construction of a Bayesian scoring system, comprising 19 attributes, for preoperative diagnosis. The scoring system was integrated into the routine clinical management of a prospective series of 830 patients. Laparotomy was performed in 310 cases, and of these 256 had acute appendicitis (perforation in 14%). ⋯ The scoring system had 90.2% sensitivity, 91.4% specificity, 82.5% positive predictive value and 95.4% negative predictive value. The system is regarded only as an aid in diagnosis, to be used in combination with clinicians' judgements. Construction of a local data base probably is essential for results equivalent to those here reported.