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Table 2 Change in percentage of iv antibiotic prescriptions >72 h and median antibiotic duration (days) during the pre-intervention and post-intervention period and comparison between the intervention and control group using interrupted time series analysis

From: An electronic trigger tool to optimise intravenous to oral antibiotic switch: a controlled, interrupted time series study

  Slope during the pre-intervention period (SE) P Change in level after interventiona (SE) P Slope during the post-intervention periodb (SE) P
Percentage of iv antibiotic prescriptions >72 h (%)
 Intervention group −0.03 (0.42) 0.94 −19.30 (4.41) <0.01 0.48 (0.59) 0.43
 Control group −0.36 (0.25) 0.16 −6.12 (2.61) <0.05 −0.26 (0.35) 0.46
 Difference between intervention and control group 0.33 (0.48) 0.50 −13.17 (5.13) <0.05 0.74 (0.68) 0.29
Median duration of iv antibiotics (days)
 Intervention group −0.02 (0.03) 0.49 −0.77 (0.29) 0.015 0.02 (0.04) 0.63
 Control group −0.38 (0.03) 0.16 −0.15 (0.28) 0.59 0.04 (0.04) 0.32
 Difference between intervention and control group 0.02 (0.04) 0.62 0.62 (0.41) 0.14 −0.02 (0.05) 0.72
  1. aMeasures the immediate impact of the intervention
  2. bMeasures the long-term impact over time of the intervention