Table 1.

Characteristics of studies included in the meta-analysis of peak VO₂

Author	Years	N	Enrollment	Follow-up (m)	Test mode	Threshold	End point	Event rate (%)	Study quality (%)
Corra et al.	2006	231	1995–2001	39	CE	14.8	D/CT	36	78.6
Davies et al.	2006	243	1992–1996	108	TM	14.7	D	57	64
Ferreira et al.	2010	663	1999–2006	36	CE & TM	12–14	D/CT	28.9	64
Francis et al.	2000	303	1992–1996	24	TM	14	D	30	64
Goda et al.	2010	681	1993–2008	32	TM	14	D/CT/VAD	49.5	64
Guimaraes et al.	2008	391	1999–2004	28	TM	16	CD/CT	53.7	71
Ingle et al.	2011	423	NR	12	TM	20	D	28	71
Kruger et al.	2006	83	2000–2001	14	CE	14	CD/AD	16.8	86
MacGowan et al.	1997	104	1991–1993	18	CE & TM	15	D	17	71
Mancini et al.	1991	79	1986–1989	15	TM	14	D	25	78.6
Mezzani et al.	2003	570	1996–2000	19.6	CE	14	CD/CT	14	71
Myers et al.	2009	847	1993–2007	36	CE & TM	14	D/CT	17	78.6
Opasich et al.	1998	372	1992–1995	24	TM	14	CD/CT	45	71
Osada et al.	1998	500	1991–1996	36	TM	14	D/CT listing	25.6	57
Peterson et al.	2003	540	1994–2001	36	TM	14	D/CT	25	71
Sarullo et al.	2010	184	2006–2007	12	CE	12.2	D/C CH	51	78.6
Shakar et al.	2004	127	1992–1999	31.2	CE & TM	14	D/CT	19.7	71
Sun et al.	2010	508	NR	6	CE & TM	11	D/C CH	25	86
Robbins et al.	1999	470	NR	18	TM	13.9	D/CT	15.1	64
Median		391		24		14		25.6	71

NR not reported, CE cycle ergometer, TM treadmill, D death, CD cardiac death, CT cardiac transplantation, CH cardiac hospitalization, VAD ventricular assist device