Table 1.

Comparison of Two Non-exercise Models for Predicting CRF

Variables	Heil et al8N = 374	Bradshaw et al3N = 100
	β
Intercept	36.580	48.073
Gender (male = 1, female = 0)	3.706	6.178
Age (years)	0.558	−0.246
Age2	−7.81 E-3
Percent body fat	−0.541
Body mass index (kg-m−2)		−0.619
Activity code (0-7)	1.347
Physical activity rating (0–10)		0.671
Perceived functional abilty		0.712
	R(R2)
	.88 (.77)	.93 (.87)
	SEE
	4.90·mL–kg−1·min−1	3.44 mL·kg−1min−1
	SEE%
	12.7%	8.6%