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

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

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

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
Legend: ASA American Society of Anesthesiologists, ICU Intensive Care Unit, HDU High Dependency Unit, yrs years
^arefer to Before period

ISSN: 1471-2474