Completeness and selection bias of a Belgian multidisciplinary, registration-based study on the EFFectiveness and quality of Endometrial Cancer Treatment (EFFECT)

Table 3 Center characteristics associated with hospital participation in EFFECT

Center characteristics	Univariable regression				Multivariable regression
Center characteristics	OR	95% CI	P-value (specific)	P-value (overall)	OR	95% CI	P-value (specific)	P-value (overall)
Volume (ref = High)				< 0.001				< 0.01
Low	0.13	0.04–0.45	< 0.01		0.16	0.04–0.61	< 0.01
Medium	0.61	0.16–2.34	0.47		0.74	0.17–3.17	0.68
Region (ref = Flemish)				< 0.01				0.04
Brussels Capital	2.29	0.44–11.83	0.32		0.91	0.14–6.00	0.92
Walloon	0.29	0.12–0.69	< 0.01		0.28	0.10–0.79	0.02
University status (ref = University)				0.12				0.61
Non-university	0.18	0.02–1.57	0.12		0.56	0.06–5.39	0.61
Ownership status (ref = Private)				0.58				0.84
Public	0.78	0.33–1.87	0.58		1.11	0.38–3.24	0.84

Estimated odds ratios (ORs) for participation of hospitals in EFFECT. ORs are expressed together with their corresponding 95% Wald Confidence Interval (CI) and P-value. P-value (specific) expresses the statistical significance of the specific comparison with the reference group (ref), whereas p-value (overall) expresses the statistical significance of the overall association of the characteristic under investigation with the outcome of interest (i.e., hospital participation status: participating or non-participating)

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