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Table 2 Change in the ICU-CRAB ID: results from the Intervention Time Series Analysis model

From: A five-component infection control bundle to permanently eliminate a carbapenem-resistant Acinetobacter baumannii spreading in an intensive care unit

Explanatory variables Lag (months) Coefficents Standard error T-ratio p value
Constant 0 2.1900 0.2112 10.37  < 0.001
Short-term Intervention 0 − 7.2215 3.4530 − 2.09  < 0.05
Long-term Intervention 0 − 2.2161 0.6353 − 3.49  < 0.01
Imported CRAB 1 0.7156 0.1534 4.67  < 0.01
ICU-CRAB (MA) 2 0.4791 0.0940 5.09  < 0.01
ICU-CRAB (MA) 5 0.6079 0.0877 6.93  < 0.001
ICU-CRAB (AR) 1 0.4149 0.097 4.26  < 0.01
  1. R2: 0.352, Effective Number of observations: 82
  2. Interpretation of coefficients:
  3. Every change by one unity of an explaining series, implies a change of (the value of the coefficient) lagged by calculated lags (in month) in the dependent series (± t*SE)
  4. The short-term intervention coefficient means that in the period postintervention a diminution of -7.2 (± 1.96*3.3452*0.69) new cases of nosocomial ICU CRAB/1000 bed-days was observed
  5. The long-term intervention coefficient means that in the period postintervention a diminution of 2.2 (± 1.96*0.63) new cases of nosocomial ICU CRAB/1000 bed-days was observed
  6. Imported CRAB term means that for every new imported ICU case, 0.72 new ICU cases occurred one month later
  7. ICU CRAB term indicates the impact of past values of the own dependent series:
  8. - AR: Autoregressive term, reflecting impact of previous CRAB-ID (past inertia lagged by 1 month)
  9. - MA: Moving Average term (past abrupt changes lagged by 2 and 5 months)
  10. ICU-CRAB ID: nosocomial colonization or infection by carbapenem-resistant A. baumannii Incidence Density