Table 4.

Equivalence analysis of the ACSM equation and the FRIEND equation.

Equation	ACSM	FRIEND
Mean bias error (MBE)	4.559	−0.008
CI	4.165–4.952	−0.320–0.304
Mean square error (MSE)	32.456	7.318
CI	28.489–36.433	5.881–8.755
Mean absolute percent error (MAPE)	20.963	8.937
CI	19.501–22.426	8.052–9.822
Lin’s concordance correlation coefficient (Lin’s CCC)	0.678	0.870
CI	0.642–0.711	0.841–0.895

CI; 95% confidence interval, MBE; mean value of [estimated VO2max − directly measured VO2max], MSE; mean value of [(estimated VO2max − directly measured VO2max)²], MAPE; mean value of [$\frac{\left|\mathrm{estimated} \mathrm{VO}2\max – \mathrm{directly} \mathrm{measured} \mathrm{VO}2\max \right|}{\mathrm{directly} \mathrm{measured} \mathrm{VO}2\max }$ × 100].