BMC Health Services Research

Table 4 Factors associated with wait time for surgery in hip and knee replacement surgery

From: A single-entry model and wait time for hip and knee replacement in eastern health region of Newfoundland and Labrador 2011–2019

Variables	Hip replacement surgery (n = 806)						Knee replacement surgery (n = 1153)
	Unadjusted Hazard Ratios			Adjusted Hazard Ratios^a			Unadjusted Hazard Ratios			Adjusted Hazard Ratios^a
	HR	95% CI	p	HR	95% CI	p	HR	95% CI	p	HR	95% CI	p
Age group			0.4419			0.2145			0.1278			0.2428
< 65	0.947	0.824–1.088		0.913	0.792–1.054		0.914	0.814–1.026		0.932	0.827–1.049
≥ 65
Diagnosis			0.0079			0.0163			0.2560			0.1482
Osteoarthritis	0.745	0.599–0.926		0.759	0.606–0.950		0.899	0.749–1.080		0.870	0.720–1.051
Others
Patient’s preference*WT2			0.0316
WT2 = 0 day						0.0045*			0.0024*			0.0229*
Next available	0.645	0.485–0.858		0.798	0.683–0.932		0.826	0.730–0.934		0.863	0.761–0.980
Specific surgeon
WT2 = 182 days
Next available	0.848	0.726–0.990
Specific surgeon
Year of referral^b*WT2			0.0001			0.0075			<.0001			<.0001
WT2 = 0 day
2011–2013	1.442	1.028–2.023		1.245	0.875–1.771		1.229	0.903–1.674		1.191	0.870–1.631
2014–2016	0.544	0.383–0.773		0.540	0.379–0.770		0.482	0.350–0.666		0.487	0.352–0.674
2017–2019
WT2 = 182 days
2011–2013	0.968	0.807–1.161		0.948	0.785–1.144		0.812	0.696–0.947		0.780	0.660–0.923
2014–2016	0.651	0.550–0.771		0.645	0.543–0.765		0.553	0.474–0.646		0.566	0.484–0.662
2017–2019
Priority*WT2			<.0001			0.0015			0.0102
WT2 = 0 day												0.3512**
P1	0.685	0.448–1.049		0.676	0.438–1.042		1.337	0.905–1.975		1.012	0.812–1.262
P2	0.388	0.260–0.579		0.447	0.294–0.679		0.767	0.587–1.002		0.909	0.780–1.058
P3
WT2 = 182 days
P1	0.824	0.623–1.089		0.827	0.621–1.102		1.140	0.914–1.420
P2	0.758	0.538–0.981		0.810	0.619–1.059		0.934	0.811–1.077
P3

^aExtended Cox proportional hazard model adjusted for age group, diagnosis, patient’s preference, year of referral, priority, and their interaction with time, where applicable
^bThe year when a patient was referred to the OCI for a hip or knee replacement surgery assessment
* p-value for patient’s preference
** p-value for priority

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