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Table 3 Incidence rate-ratios for an interrupted time-series model of antibiotic prescriptions

From: Implementation of an antimicrobial stewardship program targeting residents with urinary tract infections in three community long-term care facilities: a quasi-experimental study using time-series analysis

Parameter Co-efficient Incidence rate ratio (95 % confidence interval) P-value
  Antibiotic starts, UTI
Pre-intervention trend β1 1.04 (1.00–1.07) 0.06
Immediate intervention change β2 0.74 (0.64–0.84) <0.001
Change in trend after intervention β3 0.91 (0.89–0.93) <0.001
Intervention trend β1 + β3 0.94 (0.92–0.97) <0.001
  All antibiotic starts
Pre-intervention trend β1 1.04 (0.96–1.13) 0.30
Immediate intervention change β2 0.75 (0.67–0.84) <0.001
Change in trend after intervention β3 0.91 (0.81–1.02) 0.09
Intervention trend β1 + β3 0.95 (0.92–0.98) 0.001