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Table 4 Multivariate analyses for the association between pre- and post-intervention outcomes in different patient and ED characteristic subgroups

From: Improving Emergency Department radiology transportation time: a successful implementation of lean methodology

  Measure of association P-value P-value for interaction
Transportation (min)
  Adjusted Beta (95% CI)   
 ESI
  ≤ 3 (n = 8080) −15.17 (−16.07; −14.27) <0.0001 <0.0001
  > 3 (n = 2983) −7.63 (−8.41; −6.84) <0.0001
 Disposition
  Admitted (n = 2886) −19.61 (−21.46; −17.76) <0.0001 <0.0001
  Discharged (n = 8177) −10.65 (−11.31; −9.99) <0.0001
 Radiographer Shift
  Day (n = 5451) −11.98 (−12.91; −11.05) <0.0001 0.002
  Evening (n = 5612) −14.01 (−15.05; −12.98) <0.0001
 Day of the week
  Weekday (n = 7900) −13.49 (−14.32; −12.67) <0.0001 0.03
  Weekend (n = 3163) −11.58 (−12.86; −10.29) <0.0001
 Volume per day
  ≤ 134 (n = 5679) −12.79 (−13.78; −11.80) <0.0001 0.41
  > 134 (n = 5384) −13.26 (−14.23; −12.28) <0.0001
Length of stay (hrs)
 ESI
  ≤ 3 (n = 8080) −1.42 (−1.84; −1.00) <0.0001 <0.0001
  > 3 (n = 2984) −0.16 (−0.29; −0.04) 0.01
 Disposition
  Admitted (n = 2886) −3.91 (−5.01; −2.81) <0.0001 <0.0001
  Discharged (n = 8178) −0.05 (−0.13; 0.02) 0.17
 Radiographer Shift
  Day (n = 5451) −1.26 (−1.70; −0.83) <0.0001 0.15
  Evening (n = 5613) −0.81 (−1.24; −0.37) <0.0001
 Day of the week
  Weekday (n = 7901) −1.33 (−1.72; −0.93) <0.0001 0.004
  Weekend (n = 3163) −0.26 (−0.66; 0.14) 0.20
 Volume per day
  ≤ 134 (n = 5679) −0.58 (−0.94; −0.23) 0.001 0.01
  > 134 (n = 5385) −1.41 (−1.91; −0.91) <0.0001