Table 3.

Results of Stepwise regression using FHRV parameters, including estimated coefficients (b₀, b₁ and b₂) and Standard Error (SE) of the coefficients, t-statistic and p-value for the F-statistic of the hypothesis of the coefficient being zero.

	Estimate	SE	t-test	p-value
Intercept	4.788	10.866	0.441	0.661
mRR	0.064	0.026	2.432	0.018
SDRR	0.120	0.058	2.044	0.046

The model was obtained based on the parameters in milliseconds and GA in weeks. Other results include: F-statistics: 6.08, p-value: 0.004, standard deviation of the error distribution: 5.55 (weeks), R-squared: 18%, adjusted R-squared 15%.