Heart Rate Variability Outcome Measures at Follow-Up.

Data are mean (SD).Analyses adjusted for age, ethnicity, and antidepressant medication use.Statistical notations: (*) significant overall main effect (P?) significant group effect (P?) significantly different from control (PAbbreviations: SDNN, standard deviation of RR intervals; rMSSD, Root mean square successive difference of RR intervals; HF, log high frequency spectral power (0.15�C0.40 Hz); LF, log low frequency spectral power (0.04�C0.15 Hz); VLF, log very low frequency spectral power (0.0033�C0.04 Hz); PT, log total spectral power frequency.