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Time Series Analysis Results: Incidence Rate Ratios for Nucleic Acid Amplification Testing Versus 2-Step Clostridioides difficile Infection Confirmation
| Intervention | Intervention Effect | IRRa (95% CI) | P Value |
|---|---|---|---|
| 2-step CDI confirmation | Baseline trend | 0.80 (.69–.93) | .003 |
| Level change | 0.53 (.48–.60) | <.001 | |
| Slope change | 1.03 (.79–1.34) | .855 |
Abbreviations: CDI, Clostridioides difficile infection; CI, confidence interval; IRR, incidence rate ratio.
IRRs expressed per 12-month period.
