Table 2.
Overall CDI incidence rates stratified by case definition, 2013–2017
| Study year | Total person-time under risk (person-years) | Main case definition | Broad case definition | Strict case definition | |||
|---|---|---|---|---|---|---|---|
| Incident CDI casesa | Incidence rate per 100,000 person-years (95% CI) | Incident CDI casesa | Incidence rate per 100,000 person-years (95% CI) | Incident CDI casesa | Incidence rate per 100,000 person-years (95% CI) | ||
| 2013 | 3,191,463 | 4509 | 141 (137–145) | 7084 | 222 (217–227) | 4489 | 141 (137–145) |
| 2014 | 3,204,934 | 4367 | 136 (132–140) | 7229 | 226 (220–231) | 4359 | 136 (132–140) |
| 2015 | 3,223,450 | 4554 | 141 (137–145) | 7695 | 239 (233–244) | 4534 | 141 (137–145) |
| 2016 | 3,236,277 | 3994 | 123 (120–127) | 6449 | 199 (194–204) | 3974 | 123 (119–127) |
| 2017 | 3,225,186 | 3859 | 120 (116–123) | 6247 | 194 (189–199) | 3844 | 119 (115–123) |
CDI Clostridioides difficile infection, CI confidence interval
aIncident CDI cases are defined by no previous occurrence matching the case definition within 60 days prior to the CDI occurrence