Table 3.

Subgroup analyses: hazard ratios for overall survival (SHI) following treatment in DKG-certified ovarian cancer centers

Variable	Category	Univariable Cox-regression				Multivariable Cox-regressiona
		p	HR	lower CI	upper CI	P	HR	lower CI	upper CI
Age	18–59	0.719	1.022	0.906	1.154	0.080	0.890	0.782	1.014
	60–79	< 0.001	0.836	0.782	0.893	0.008	0.902	0.836	0.973
	80+	< 0.001	0.770	0.693	0.855	0.001	0.838	0.753	0.933
Year of diagnosis	2009-11	< 0.001	0.810	0.733	0.895	0.055	0.892	0.793	1.002
	2012-14	< 0.001	0.810	0.736	0.892	0.344	0.950	0.854	1.056
	2015-17	< 0.001	0.638	0.570	0.715	< 0.001	0.803	0.717	0.900
Tumor characteristics: stage	Local (without C77-C79)	< 0.001	0.657	0.572	0.754	0.020	0.834	0.716	0.972
	Regional metastasis (C77, without C78-C79)	0.265	0.854	0.647	1.127	0.745	1.060	0.745	1.508
	Distant metastasis (C78-C79)	< 0.001	0.736	0.687	0.788	0.001	0.878	0.814	0.946
Hospital beds	1–299	0.007	0.500	0.302	0.828	0.041	0.642	0.420	0.983
	300–499	0.027	0.865	0.760	0.983	0.087	0.896	0.790	1.016
	500–999	0.003	0.846	0.758	0.943	0.004	0.842	0.748	0.947
	1000+	0.001	0.830	0.742	0.930	0.426	0.956	0.856	1.068

^aadjusted for age, year of diagnosis, elixhauser comorbidities and hospital characteristics if not stratified by the same variable