Table 3.

Regression coefficients (β), P value, and coefficient of determination (R²) for the association of log (HOMA_IR) with CVF and body composition in 2 multiple regression models, after adjusting for sex and age.

	Variables	β (se)	P value+	R2	RMSE**
Model 1	VO2 max/kgLBM	−0.027 (0.006)	<.001*	0.57	1.42
	%BF	0.035 (0.005)	<.001*
Model 2	PACER (laps)	−0.012 (0.004)	.0050*	0.45	1.49
	BMI z score	0.201 (0.057)	.0007*

⁺P-value for testing H₀: β = 0 versus H_A: β ≠ 0.

**Cross-validation Root Mean Square Error (RMSE) on original scale for m = 1000 re-samples with sample size n₁ = 50 (model fitting) and n₂ = 32 (model validation).

*P < .05.