Fig. 2
Observed/Expected (O/E) ratio and Exclusivity ratio for 10 most frequent medical specialties in the identified clusters. Medical specialties in bold had an O/E ratio ≥2 or Exclusivity ratio ≥0.25 and therefore characterized the cluster. Dashed lines indicate an O/E ratio ≥2 or Exclusivity ratio ≥0.25. The (O/E)xy ratio is the observed prevalence of medical specialty x in cluster y (Oxy) divided by the expected prevalence of medical specialty x in the overall sample (Ex). The exclusivity ratio EXxy is the sum of the membership degrees of cluster y for patients with the specialty x compared to the total number of patients with the specialty involved (nx)