Table 2 .

Cox regression models for 90-day readmission or death

Variable	Model 1	Model 2	Model 2 +
			Fried	CFS	SPPB	PRISMA-7	EHR score
Age	1.23* (1.02–1.48)	1.22* (1.01–1.48)	1.14 (0.95–1.39)	1.14 (0.93–1.39)	1.19 (0.98–1.44)	1.16 (0.95– 1.41)	1.16 (0.95–1.40)
Male sex	0.92 (0.63–1.35)	0.86 (0.59–1.27)	1.06 (0.70–1.58)	0.91 (0.62–1.34)	0.94 (0.62–1.43)	0.83 (0.56– 1.23)	0.94 (0.64–1.40)
Co-morbidity		1.32** (1.11–1.56)	1.21* (1.01–1.44)	1.26** (1.06–1.50)	1.28** (1.07–1.52)	1.28** (1.08– 1.53)	1.06 (0.82–1.38)
Frailty tool			1.47*** (1.18–1.81)	1.24* (1.01–1.51)	1.13 (0.91–1.40)	1.17 (0.95– 1.45)	1.35* (1.02–1.78)

Age, co-morbidity and frailty measures have been standardised, with the output representing the HR (95% CI) for 90-day readmission or death per SD increase in each variable. For clearer comparison with other measures, the SPPB score has been reversed, such that increasing values represent greater impairment.

Significance of each model output denoted by ^*P < 0.05, ^**P < 0.01, ^***P < 0.001. Results in bold are significant to at least p < 0.05