BMC Health Services Research

Table 6 Hazard ratios and 95% CI for interaction between time and covariates (Cox proportional hazards models)*

From: Socioeconomic differences in waiting times for elective surgery: a population-based retrospective study

	CABG	Angioplasty	Coronarography	Endarterectomy	Hip replacement	Cholecystectomy
Education
Low education		1.004 [1.001 - 1.006]	1.001 [1.000 - 1.003]	1.005 [1.002 - 1.007]	1.001 [1.001 - 1.002]	1.001 [1.000 - 1.002]
Middle education		1.002 [1.000 - 1.005]		1.004 [1.001 - 1.007]	1.001 [1.000 - 1.001]	1.001 [1.000 - 1.002]
Age groups (years)
65-74					1.001 [1.000 - 1.001]
CCI
1				1.002 [1.000 - 1.004]		1.001 [1.000 - 1.002]
> = 2		1.004 [1.001 - 1.007]	1.004 [1.002 - 1.006]		1.002 [1.000 - 1.004]	0.997 [0.995 - 0.999]
Year of registration
<2006		1.004 [1.000 - 1.009]		1.012 [1.009 - 1.016]	1.003 [1.002 - 1.003]	1.001 [1.001 - 1.002]
2007				1.003 [1.001 - 1.005]	1.000 [0.999 - 1.000]
2008		1.004 [1.001 - 1.006]		1.004 [1.001 - 1.006]
Location
LHA - Province of Turin		1.012 [1.009 - 1.015]	1.010 [1.008 - 1.012]	1.060 [1.046 - 1.075]	1.004 [1.003 - 1.004]	1.001 [1.000 - 1.002]
LHA - Eastern Piedmont	1.030 [1.021 - 1.040]
LHA - Southern Piedmont			1.007 [1.003 - 1.011]		1.005 [1.005 - 1.006]	1.005 [1.004 - 1.006]
LHA - Northern Piedmont	1.022 [1.015 - 1.030]					1.001 [1.000 - 1.002)
HT - City of Turin	0.992 [0.986 - 0.997]		1.006 [1.005 - 1.008]		1.004 [1.003 - 1.004]
HT - Piedmont Region		0.972 [0.964 - 0.979]	0.979 [0.976 - 0.982]	1.003 [1.001 - 1.004]	1.004 [1.004 - 1.005]	1.003 [1.002 - 1.004]
Other Hospitals					1.006 [1.005 - 1.006]	1.004 [1.003 - 1.005]

CI = confidence interval, CABG = Coronary Artery Bypass Graft, CCI = Charlson Comorbidity Index, LHA = Local Health Authority, HT = Health Trust.
*: only statistically significant effects.

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