Table 5

Univariate regression output for the cancelled elective operations outcome variable

Variable	Parameters	Year
Variable	Parameters	2012	2013	2014	2015	2016
Empty day beds	R²	0.00	0.00	0.00	0.00	0.00
	Reg coef (95% CIs)	0.009 (−0.047 to 0.066)	0.009 (−0.046 to 0.064)	0.008 (−0.051 to 0.066)	−0.014 (−0.079 to 0.051)	−0.003 (−0.069 to 0.062)
	P value	0.75	0.75	0.8	0.68	0.92
Empty night beds	R²	0.01	0.02	0.00	0.00	0.02
	Reg coef (95% CIs)	−0.135 (−0.328 to 0.059)	−0.130 (−0.307 to 0.047)	−0.087 (−0.273 to 0.099)	−0.066 (−0.260 to 0.129)	−0.149 (−0.336 to 0.039)
	P value	0.17	0.15	0.36	0.51	0.12
Delayed transfers	R²	0.01	0.00*	0.01*	0.03*	0.03
	Reg coef (95% CIs)	0.087 (−0.064 to 0.237)	0.040 (−0.097 to 0.178)	0.065 (−0.063 to 0.192)	0.108 (−0.007 to 0.222)	0.103 (0.004 to 0.201)
	P value	0.26	0.56	0.32	0.07	0.04
Day bed:night bed ratio	R²	0.01	0.00	0.00	0.00	0.00
	Reg coef (95% CIs)	1.067 (−0.733 to 2.868)	0.589 (−0.997 to 2.175)	0.245 (−1.410 to 1.900)	0.255 (−1.444 to 1.954)	−0.677 (−2.437 to 1.082)
	P value	0.24	0.46	0.77	0.77	0.45
ED conversion ratio	R²	0.05	0.02	0.07	0.06	0.07
	Reg coef (95% CIs)	1.728 (0.402 to 3.055)	1.020 (−0.288 to 2.327)	2.275 (0.914 to 3.637)	2.108 (0.627 to 3.589)	2.419 (0.901 to 3.937)
	P value	0.01	0.13	<0.01	<0.01	<0.01
Admission casemix ratio	R²	0.02	0.05	0.13	0.12*	0.11
	Reg coef (95% CIs)	0.240 (−0.016 to 0.496)	0.318 (0.082 to 0.553)	0.507 (0.288 to 0.726)	0.524 (0.275 to 0.772)	0.518 (0.258 to 0.778)
	P value	0.07	<0.01	<0.001	<0.001	<0.001
Emergency admission:bed ratio	R²	0.00	0.00	0.00	0.00	0.00
	Reg coef (95% CIs)	0.029 (−0.077 to 0.136)	0.010 (−0.087 to 0.108)	0.009 (−0.089 to 0.107)	−0.025 (−0.136 to 0.087)	−0.033 (−0.143 to 0.077)
	P value	0.58	0.84	0.85	0.66	0.56

*Indicates non-normality, heteroskedasticity or influential outlier in regression.
ED, emergency department; Reg coef, regression coefficient, β.