. Author manuscript; available in PMC: 2020 May 21.

Published in final edited form as: J Cardiopulm Rehabil Prev. 2012 May-Jun;32(3):141–146. doi: 10.1097/HCR.0b013e31824f9ddf

Table 3 •.

Relative Risks Associated With Peak ${\overset{\cdot}{V} O}_{2}$ , ${\overset{\cdot}{V}}_{E}$ / ${\overset{\cdot}{V} co}_{2}$ Slope, HHR₁, and Their Combination

Groups	Hazard Ratio	95% CI	P Value
Peak ${\overset{\cdot}{V} co}_{2}$ ≥ 14 mL·kg⁻¹·min⁻¹	1 (Ref)	…	…
Peak ${\overset{\cdot}{V} co}_{2}$ 10.1–13.9 with
${\overset{\cdot}{V}}_{E}$ / ${\overset{\cdot}{V} co}_{2}$ ≥ 34 or HRR₁ <16	1.81	1.07–3.05	.02
Peak ${\overset{\cdot}{V} O}_{2}$ 10.1–13.9 mL·kg⁻¹·min⁻¹ with
${\overset{\cdot}{V}}_{E}$ / ${\overset{\cdot}{V} co}_{2}$ ≥ 34 and HRR₁ < 16	3.51	2.33–5.29	<.001
Peak ${\overset{\cdot}{V} O}_{2}$ ≤ 10 mL·kg⁻¹·min⁻¹	3.11	2.07−4.68	<.001

Abbreviations: ${\overset{\cdot}{V} O}_{2}$ , oxygen uptake; ${\overset{\cdot}{V}}_{E}$ / ${\overset{\cdot}{V} co}_{2}$ slope, minute ventilation/carbon dioxide production ( ${\overset{\cdot}{V} co}_{2}$ ) slope; HRR₁, heart rate recovery at the first minute.