Supplementary Table 1.

Scenario questions: Multivariate conditional logistic regression models evaluating the likelihood of requesting a RTB after adjusting for statistical interactions between terms^*

	Age, years OR (95% CI)			Comorbidities OR (95% CI)		Renal function OR (95% CI)
Variables	50–65	70–75	≥80	None/minimal	Multiple	Normal	Poor
Age, years
50–65	N/A			REF	REF	REF	REF
70–75				1.2 (0.8–1.7)	0.4 (0.3–0.6)	0.9 (0.6–1.3)	0.5 (0.3–0.7)
≥80				0.3 (0.2–0.4)	0.08 (0.05–0.12)	0.3 (0.2–0.4)	0.07 (0.05–0.11)
Comorbidities
None/minimal	REF	REF	REF	N/A		REF	REF
Multiple	2.5 (1.7–3.7)	0.8 (0.6–1.2)	0.9 (0.6–1.3)			1.8 (1.3–2.5)	0.8 (0.6–1.1)
Renal function
Normal	REF	REF	REF	REF	REF	N/A
Poor	3.7(2.5–5.5)	2.0 (1.3–2.8)	1.1 (0.7–1.6)	3.0 (2.2–4.0)	1.3 (0.95–1.8)

^*Every presented OR (95% CI) is produced from separate models taking into account one interaction at the time while adjusting for the other variable.

CI: confidence interval; OR: odds ratio; REF: reference.