(b) Baseline characteristics of patients in the included studies

First Author	Mean STS (%)		Logistic EuroSCORE		Left Ventricle EF (%)		Mean Gradient (mm Hg)
	nonagenarian group	control group	nonagenarian group	control group	nonagenarian group	control group	nonagenarian group	control group
Yamamoto et al.	13.4±7.2	12.3±8.8	26.6±9.3	23.6±12.4	51.3±12.3	48.6±14.2	56.3±23.4	45.5±15.4
Arsalan et al.	9.22 (6.73-13.25)	6.34 (4.20-9.77)	NR	NR	58(48-65)	56(45-63)	NR	NR
Ramkumar et al.	5.7±2.2	3.6±1.8	5.5±5.4	4.0±3.3	53.7±17	59.1±11	44.7±14	49.6±16
Miura et al.	10.0(7.5-12.0)	6.0(3.0-7.0)	20.0(16.0-25.5)	14.0(11.0-22.0)	63.2±6.9	61.8±9.0	59.6±19.0	54.2±19.9
Scholtz et al.	8.5±4.8	6.3±4.5	27.7±14.8	23.1±14.4	54.6±9.5	52.5±11.4	47.1±17.3	45.1±16.8