Table 2. Apparent loss of prognostic power of Peak VO₂ threshold over time and likelihood of different prognostic thresholds giving positive results.

	Number of studies testing a peak VO2 threshold and finding it to be prognostically significant	Number of studies testing a peak VO2 threshold and finding it to be not prognostically significant
Publication year
1986–1990	3 (100%)	0 (0%)
1991–1995	4 (80%)	1 (20%)
1996–2000	6 (75%)	2 (25%)
2001–2005	3 (38)	5 (62%)
2006–2010	2 (22%)	7 (78%)
Threshold tested (ml/kg/min)
9–10.9	2 (100%)	0 (0%)
11–12.9	1 (100%)	0 (0%)
13–14.9	11 (44%)	14 (56%)
15–16.9	2 (66%)	1 (34%)
17–18.9	2 (100%)	0 (0%)