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Table 6 Association between study period and LOS using multiple regression modelling

From: Implementing early mobilisation after knee or hip arthroplasty to reduce length of stay: a quality improvement study with embedded qualitative component

Parameter Estimate Wald 95% Confidence Limits Wald Chi-Square P-Value
Intervention period (ref Before)a −0.085 −0.169 −0.001 3.97 0.046
Day of surgery (ref Monday)
 Tuesday 0.075 −0.071 0.221 1.02 0.313
 Wednesday 0.120 − 0.035 0.275 2.31 0.128
 Thursday 0.174 0.004 0.346 4.00 0.046
 Friday 0.033 −0.114 0.180 0.19 0.662
Male 0.155 0.063 0.248 10.86 0.001
Total knee arthroplasty 0.009 −0.137 0.155 0.01 0.905
Unilateral procedure 0.251 0.037 0.464 5.30 0.021
Osteoarthritis 0.118 −0.113 0.349 1.00 0.317
Surgery start, morning 0.039 −0.058 0.136 0.61 0.433
ASA 3 or 4 −0.041 −0.134 0.052 0.76 0.384
English-speaking interpreter required −0.146 −0.237 − 0.055 9.88 0.002
Other lower limb or back issues −0.057 −0.144 0.029 1.71 0.191
ICU/HDU admission −0.352 −0.524 − 0.180 16.06 <.0001
Acute complication −0.389 −0.485 − 0.294 63.91 <.0001
Peripheral nerve block −0.033 −0.163 0.097 0.25 0.616
Age, yrs 0.012 0.007 0.018 22.27 <.0001
Body mass index, kg/m2 0.007 0.001 0.014 4.43 0.035
  1. The incident risk ratio derived from the estimate is 0.92 (0.85 to 1.00). Thus the intervention period was associated with an 8.1% reduction in length of stay
  2. Legend: ASA American Society of Anesthesiologists, ICU Intensive Care Unit, HDU High Dependency Unit, yrs years
  3. arefer to Before period