Table 2.
Categorization of CDI episodes in the different 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) |
aThe number of CDI events is reduced by 205 due to diagnosis of CDI by a positive test result only
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