Control of a Clonal Outbreak of Multidrug-Resistant Acinetobacter baumannii in a Hospital of the Basque Country after the Introduction of Environmental Cleaning Led by the Systematic Sampling from Environmental Objects

Table 3

Poisson regression analysis of different factors involved in the outbreak (univariate analysis).

Factor	𝛽 coefficient	𝑃	RR	95%CI RR
Positive in common areas	0.33	0.051	1.40	0.99–1.94
Positive in rooms	0.17	0.048	1.19	1–1.40
Number of carriers	0.06	0.828	1.06	0.62–1.81
Week; (continuous data)	−0.01	0.075	0.99	0.97–1
Month; (continuous data)	−0.06	0.068	0.94	0.87–1
Quarter; (continuous data)	−0.16	0.126	0.85	0.69–1.05
Quarter; (categorical data)
Q3-2009			1
Q4-2009	−1.18	0.022	0.31	0.11–0.85
Q1-2010	−0.15	0.688	0.86	0.41–1.78
Q2-2010	−0.49	0.234	0.62	0.28–1.37
Q3-2010	−1.10	0.033	0.33	0.12–0.92

Univariate regression model with the number of infected subjects as the dependent variable, and the following independent variables: the number of positive samples in common areas, the number of positive samples in rooms, the number of carriers, and time: weeks, months, and quarters (Q).