Table 3.

Coefficients of exercise allocation in intent-to-treat analysis ANCOVA models predicting HRV outcomes during sleep period.

Outcome	$\mathbf{Estimate}\mathbf{for}\mathbf{Exercise}\mathbf{Allocation}{}^{\mathbf{a}}\left(\mathit{\beta }\right)$	$\mathbf{Standard}\mathbf{Error}\left(\mathit{\beta }\right)$	95% Confidence Interval		p-Value
SDNN	−0.27	1.78	−4.08	3.53	0.88
LF	−130	260	−791	531	0.64
HF	16	75	−135	167	0.83
LF/HF-ratio	−0.17	0.34	−0.85	0.51	0.62

Note: All models used baseline values of the outcome as well as minimization factors (sex, age, PHQ9 score, and PSQI score) as covariates and allocation as the independent variable. The coefficient for allocation is the difference of the mean change score in the exercise group compared to the control group. Abbreviations: SDNN = standard deviation of normal-to-normal RR intervals; LF = low-frequency power (0.04–0.15 Hz (ms²)); HF = high-frequency power (0.15–0.4 Hz (ms²)). ^a Allocation was coded as follows: 1 = control, 2 = exercise.