Table 1.

Percentage Rate Change for All Clostridioides difficile PCR Test Orders

Model Parameter	Percentage Change (95% CI)	P Value
Harborview Medical Center
Intervention level change	−28.2% (−43.0% to −9.4%)	.005
Preintervention, pre-CDI program slope (per month)	−2.4% (−4.3% to −0.5%)	.016
Preintervention, post-CDI program slope (per month)	−6.8% (−8.6% to −5.0%)	<.001
Postintervention slope (per month)	−0.8% (−3.3% to 1.8%)	.55
University of Washington Medical Center
Intervention Level Change	−27.4% (−37.5% to −15.6%)	<.001
Preintervention slope (per month)	−1.2% (−1.8% to −0.5%)	.001
Postintervention slope (per month)	−1.7% (−3.4% to 0.1%)	.07

Abbreviations: CDI, C difficile infection; CI, confidence interval; PCR, polymerase chain reaction.