Table 2.

Results of segmented Poisson regression analysis of an interrupted time series exploring the effect of multiple interventions

Variable	Trend before INT		Change in level after INTa		Change in trend after INTb
	β1 (95% CI)	p value	β2 (95% CI)	p value	β3 (95% CI)	p value
Admission-prevalence density of CRABc	0.175 (0.052 to 0.298)	0.005	0.164 (–0.673 to 1.001)	0.700	–0.185 (–0.310 to –0.059)	0.004
Incidence density of CRABd	0.347 (0.175 to 0.517)	< 0.001	0.289 (–0.409 to 0.987)	0.417	–0.413 (–0.585 to –0.240)	< 0.001
Incidence density of CRAB including both ASC and clinical culturese	0.347 (0.161 to 0.532)	< 0.001	0.513 (–0.206 to 1.232)	0.162	–0.406 (–0.594 to –0.219)	< 0.001
Incidence density of MRSAf	0.025 (–0.043 to 0.092)	0.472	–0.137 (–1.023 to 0.750)	0.763	–0.067 (–0.150 to 0.011)	0.091

INT, intervention; CI, confidence interval; CRAB, carbapenem-resistant Acinetobacter baumannii; ASC, active surveillance cultures; MRSA, methicillin resistant Staphylococcus aureus.

^aDifferences between first value after and last value before INT.

^bMonthly change after INT when compared with trend before INT.

^cDurbin-Watson statistic (DWS) = 1.847.

^dDWS = 1.188.

^eDWS = 1.203.

^fDWS = 1.188.