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Table 2 Categorization of CDI episodes in the different databases

From: The burden of clostridium difficile infection: estimates of the incidence of CDI from U.S. Administrative databases

  Medicare Lab/Rx SID Premiera NIS
Hospital-Onset 3,223 (33.4) 449 (9.1) 46,347 (67.7) 3,984 (64.8) 211,344 (62.8)
Other Healthcare-Facility Onset 2,425 (25.1) 54 (1.1) 392 (5.7)
Community-Onset Hospital-associated 1,258 (13.0) 599 (12.2) 8,048 (11.8)
Community-Onset Indeterminate-association 561 (5.8) 451 (9.2) 4,139 (6.0)
Community-Onset Community-associated 2,185 (22.6) 3,360 (68.4) 9,514 (13.9)
Community-Onset Unknown associationb 2,161 (35.2) 125,221 (37.2)
  1. aThe number of CDI events is reduced by 205 due to diagnosis of CDI by a positive test result only
  2. bEpisodes in the Premier and NIS encounter-level databases were classified as community-onset unknown association since it was not possible to determine prior health care exposures due to lack of a person-level identifier