NEO-scores, heart rate variability values, and body characteristics (means, with SD in parentheses), separately for the group with values below and above the median of values.

and values indicate results of independent samples tests, significant test results are indicated by bold font. The outermost right column provides effect sizes as indicated by Cohen's (Hedges' bias correction, values >.2 indicate moderate effect sizes). Abbrevations: BMI: body mass index (body weight/body height); HF (n.u.): high frequency power (0.15–0.4 Hz) of the HRV in normalized units; HRV: heart rate variability; LF (n.u.): low frequency power (0.04–0.15 Hz) of the HRV in normalized units; RMSSD: root mean square of the SD of successive heart beat intervals.