. Author manuscript; available in PMC: 2020 May 22.

Published in final edited form as: Mayo Clin Proc. 2013 Feb 27;88(3):251–258. doi: 10.1016/j.mayocp.2012.11.020

TABLE 1.

Differences in Key Baseline and CPX Variables According to Aerobic Capacity

Variable	Low FIT (n=801)	High FIT (n= 1265)	P value
Age (y), mean ± SD	57.5±13.1	55.6±14.5	.003
Male sex, No. (%)	576 (72)	1050 (83)	<.001
BMI, mean ± SD	29.8±6.6	28.0±5.2	<.001
NYHA class, mean ± SD	2.8±0.74	2.2±0.80	<.001
HF ischemic etiology, No. (%)	352 (44)	455 (36)	<.001
LVEF (%), mean ± SD	26.0±9.8	30.1±10.1	<.001
Prescribed ACE inhibitor, No. (%)	505 (63)	759 (60)	.01
Prescribed β-blocker, No. (%)	609 (76)	834 (66)	<.001
Peak RER, mean ± SD	1.10±0.15	1.11±0.13	.02
VE/VCO₂ slope, mean ± SD	39.1±10.9	30.9±6.7	<.001

ACE = angiotensin-converting enzyme; BMI = body mass index; CPX = cardiopulmonary exercise testing; FIT = cardiorespiratory fitness (low: <14 mL O₂ · kg⁻¹ · min⁻¹; high: ≥14 mL O₂ · kg⁻¹ · min⁻¹); HF = heart failure; LVEF = left ventricular ejection fraction; NYHA = New York Heart Association; RER = respiratory exchange ratio; $\dot{V} O_{2}$ = oxygen consumption; VE/VCO₂ = minute ventilation/carbon dioxide production.