. 2020 Dec 10;8(1):47–54. doi: 10.1002/ehf2.13167

Table 3.

Peak VO₂ (mean, median, standard deviation, mean difference, and standard error in mL/kg/min) and correlational values from cardiopulmonary exercise and predicted by New York Heart Association functional class using Cahalin et al. ²¹ equation

NYHA	Method	Mean	Median	SD	Mean difference (standard error)	Correlation (r)
Class I and II (n = 76)	CPX	17.5	17.7	3.5	0.22 (0.27)	0.63^*
Class I and II (n = 76)	Cahalin equation	17.3	17.4	2.5	0.22 (0.27)	0.63^*
Class III (n = 30)	CPX	13.8	14.4	3.5	−0.86 (0.3)	0.67^*
Class III (n = 30)	Cahalin equation	14.48	14.63	2.7	−0.86 (0.3)	0.67^*

A significant correlation between actual CPX testing VO_{2 peak} and predicted VO_{2 peak} values at P = 0.05.