Table 3.

Cox proportional hazard regression for survival between AVF and NVF groups.

Covariate	b	SE	Wald	OR (95% CI)	p
AVF group	0.2121	0.0822	2.1021	0.7731–1.2439	0.0380
NVF group	0.3563	0.1952	3.3311	0.9740–2.0937	0.0675

Harrell’s C-index = 0.503, 95% CI (0.400–0.605); OR, Odds ratio; AVF, audio ventilation feedback; NVF, non-ventilation feedback; HR; hazard ratio; CI, confidence interval.