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Table 2 Person days, Emergency Department (ED) Presentations and Hospital Admissions expressed as rates per 1000 person days, for participants in the OPEN ARCH study by Step, differences between Intervention and Control Periods analysed as Incident Rate Ratios (IRR)

From: Impact of an integrated community-based model of care for older people with complex conditions on hospital emergency presentations and admissions: a step-wedged cluster randomized trial

  Person days ED Presentations Hospital Admissions
Control Period
Step 1
  Window 1 2585 6 4
Step 2
 Window 1 2276 13 14
  Window 2 2327 6 10
Step 3
  Window 1 2240 3 3
  Window 2 2558 9 9
  Window 3 1953 2 7
  Total days or events 13,939 39 47
  Total Rate   2.80 3.37
  95% CIs   (1.99–3.82) (1.78–3.48)
Intervention Period
Step 1
  Window 2 2784 8 6
  Window 3 2545 4 4
  Window 4 2148 3 5
Step 2
  Window 3 2464 9 8
  Window 4 2170 8 8
Step 3
  Window 4 2561 5 7
  Total days or events 14,672 37 38
  Total Rate   2.52 2.59
  95% CIs   (2.48–4.48) (1.83–3.55)
Intervention Period compared to Control Period
Incidence Rate Ratio (IRR)
  IRR   0.90 0.77
  95% CIs   (0.66–1.27) (0.58–1.05)
  1 sided p   0.254 0.040
  2 sided p   0.508 0.080
  1. Rate = (Events/Person Days) *1000. 95%Cis 95% Confidence Intervals